66 changed files with 2046 additions and 67 deletions
--- a/app/package-lock.json
+++ b/app/package-lock.json
@ -48,7 +48,8 @@
      "license": "ISC",
      "dependencies": {
        "socket.io": "^4.8.1",
-        "socket.io-client": "^4.8.1"
+        "socket.io-client": "^4.8.1",
+        "uuid": "^11.0.3"
      },
      "devDependencies": {
        "@eslint/js": "^8.0.0",
--- a/interface/.eslintrc.js
+++ b/interface/.eslintrc.js
@ -13,5 +13,7 @@ module.exports = {
    jest: true,
  },
  ignorePatterns: [".eslintrc.js", "dist/"],
-  rules: {},
+  rules: {
+    "@typescript-eslint/no-non-null-assertion": "off",
+  },
 };
--- a/interface/BoardBuilder.ts
+++ b/interface/BoardBuilder.ts
@ -0,0 +1,115 @@
+import { CellType } from "./constants/CellType";
+import { Direction } from "./constants/Direction";
+import { ExitType } from "./constants/ExitType";
+import { Cell } from "./types/Cell";
+import { Exit } from "./types/Exit";
+
+const boardSize = 7;
+const universityLocations = [
+  [2, 0],
+  [4, 1],
+  [3, 3],
+];
+const factoryLocations = [
+  [0, 0],
+  [5, 2],
+  [4, 6],
+];
+const houseLocations = [
+  [0, 2],
+  [1, 5],
+  [2, 4],
+  [5, 4],
+];
+const mapPosition = (position: number[], type: CellType) => {
+  return {
+    row: position[0],
+    col: position[1],
+    type: type,
+  };
+};
+const specialUniversityCells = universityLocations.map((position) =>
+  mapPosition(position, CellType.UNIVERSITY),
+);
+const specialFactoryCells = factoryLocations.map((position) =>
+  mapPosition(position, CellType.FACTORY),
+);
+const specialHouseCells = houseLocations.map((position) =>
+  mapPosition(position, CellType.HOUSE),
+);
+const specialCells = specialUniversityCells
+  .concat(specialFactoryCells)
+  .concat(specialHouseCells);
+
+const specialExitIndexes1 = [1, 5];
+const specialExitIndexes2 = [3];
+
+function createBoard(): Cell[][] {
+  const indexes = Array.from(Array(boardSize).keys());
+  return indexes.map((rowIndex) =>
+    indexes.map((colIndex) => {
+      const specialCell = specialCells.find(
+        (specialCell) =>
+          specialCell.row === rowIndex && specialCell.col === colIndex,
+      );
+      return new Cell(specialCell ? specialCell.type : CellType.NORMAL);
+    }),
+  );
+}
+
+function connectAdjacentCells(board: Cell[][]) {
+  const indexes = Array.from(Array(boardSize).keys());
+  for (const rowIndex of indexes.slice(0, -1)) {
+    for (const colIndex of indexes) {
+      const cell = board[rowIndex][colIndex];
+      const bottomCell = board[rowIndex + 1][colIndex];
+      cell
+        .getNodeAt(Direction.SOUTH)
+        .linkToNode(bottomCell.getNodeAt(Direction.NORTH));
+    }
+  }
+
+  for (const rowIndex of indexes) {
+    for (const colIndex of indexes.slice(0, -1)) {
+      const cell = board[rowIndex][colIndex];
+      const rightCell = board[rowIndex][colIndex + 1];
+      cell
+        .getNodeAt(Direction.EAST)
+        .linkToNode(rightCell.getNodeAt(Direction.WEST));
+    }
+  }
+}
+
+function addExits(board: Cell[][]) {
+  // Add exits to top row
+  board[0].forEach((cell, colIndex) => {
+    let exitType = ExitType.AMBIVALENT;
+    if (specialExitIndexes1.includes(colIndex)) exitType = ExitType.ROAD;
+    if (specialExitIndexes2.includes(colIndex)) exitType = ExitType.RAIL;
+    cell.getNodeAt(Direction.NORTH).linkToNode(new Exit(exitType));
+  });
+
+  // Add exits to bottom row
+  board[boardSize - 1].forEach((cell, colIndex) => {
+    let exitType = ExitType.AMBIVALENT;
+    if (specialExitIndexes1.includes(colIndex)) exitType = ExitType.ROAD;
+    if (specialExitIndexes2.includes(colIndex)) exitType = ExitType.RAIL;
+    cell.getNodeAt(Direction.SOUTH).linkToNode(new Exit(exitType));
+  });
+
+  // Add exits to left and right columns
+  board.forEach((row, rowIndex) => {
+    let exitType = ExitType.AMBIVALENT;
+    if (specialExitIndexes1.includes(rowIndex)) exitType = ExitType.RAIL;
+    if (specialExitIndexes2.includes(rowIndex)) exitType = ExitType.ROAD;
+    row[0].getNodeAt(Direction.WEST).linkToNode(new Exit(exitType));
+    row[boardSize - 1].getNodeAt(Direction.EAST).linkToNode(new Exit(exitType));
+  });
+}
+
+export function buildBoard(): Cell[][] {
+  const board: Cell[][] = createBoard();
+  connectAdjacentCells(board);
+  addExits(board);
+  return board;
+}
--- a/interface/constants/CellType.ts
+++ b/interface/constants/CellType.ts
@ -0,0 +1,6 @@
+export enum CellType {
+  NORMAL = "NORMAL",
+  HOUSE = "HOUSE",
+  FACTORY = "FACTORY",
+  UNIVERSITY = "UNIVERSITY",
+}
--- a/interface/constants/Direction.ts
+++ b/interface/constants/Direction.ts
@ -0,0 +1,30 @@
+export enum Direction {
+  NORTH = "NORTH",
+  SOUTH = "SOUTH",
+  EAST = "EAST",
+  WEST = "WEST",
+}
+
+export const directions: Direction[] = [
+  Direction.NORTH,
+  Direction.SOUTH,
+  Direction.EAST,
+  Direction.WEST,
+];
+
+export function rotateDirection(
+  initialDirection: Direction,
+  rotationAngle: 0 | 90 | 180 | 270,
+): Direction {
+  const angleToDirectionMap: Record<Direction, 0 | 90 | 180 | 270> = {
+    [Direction.NORTH]: 0,
+    [Direction.EAST]: 90,
+    [Direction.SOUTH]: 180,
+    [Direction.WEST]: 270,
+  };
+  const finalAngle =
+    (360 + angleToDirectionMap[initialDirection] - rotationAngle) % 360;
+  return (Object.keys(angleToDirectionMap) as Direction[]).find(
+    (direction) => angleToDirectionMap[direction] === finalAngle,
+  )!;
+}
--- a/interface/constants/ExitType.ts
+++ b/interface/constants/ExitType.ts
@ -0,0 +1,5 @@
+export enum ExitType {
+  RAIL = "RAIL",
+  ROAD = "ROAD",
+  AMBIVALENT = "AMBIVALENT",
+}
--- a/interface/constants/InternalNodeType.ts
+++ b/interface/constants/InternalNodeType.ts
@ -0,0 +1,4 @@
+export enum InternalNodeType {
+  NONE = "NONE",
+  STATION = "STATION",
+}
--- a/interface/constants/Pieces.ts
+++ b/interface/constants/Pieces.ts
@ -0,0 +1,410 @@
+import { Piece } from "../types/Piece";
+import { Direction } from "./Direction";
+import { InternalNodeType } from "./InternalNodeType";
+import { TrackType } from "./TrackType";
+
+const STRAIGHT_RAIL: Piece = new Piece({
+  useInternalTracks: false,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      endPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+const TURN_RAIL: Piece = new Piece({
+  useInternalTracks: false,
+  trackDefinitions: [
+    {
+      startPoint: Direction.SOUTH,
+      endPoint: Direction.EAST,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+const FOUR_WAY_CROSS_RAIL: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.NONE,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+const T_JUNCTION_RAIL: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.NONE,
+  trackDefinitions: [
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+const DEAD_END_STATION_RAIL: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+const TURN_RAIL_TO_ROAD: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+  ],
+});
+const T_JUNCTION_WITH_ROAD_ON_SIDE: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+  ],
+});
+const FOUR_WAY_WITH_ONE_ROAD: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+const T_JUNCTION_WITH_ROAD_AT_CENTER: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+const STRAIGHT_TRACK_CHANGE: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+const DEAD_END_STATION_ROAD: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+  ],
+});
+const T_JUNCTION_WITH_RAIL_AT_CENTER: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.ROAD,
+    },
+  ],
+});
+const FOUR_WAY_PERPENDICULAR_CROSSING: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+  ],
+});
+const FOUR_WAY_WITH_ONE_RAIL: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.ROAD,
+    },
+  ],
+});
+const FOUR_WAY_TURNING_CROSSING: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.STATION,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+const LEVEL_CROSSING: Piece = new Piece({
+  useInternalTracks: false,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      endPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.EAST,
+      endPoint: Direction.WEST,
+      type: TrackType.ROAD,
+    },
+  ],
+});
+const STRAIGHT_ROAD: Piece = new Piece({
+  useInternalTracks: false,
+  trackDefinitions: [
+    {
+      startPoint: Direction.EAST,
+      endPoint: Direction.WEST,
+      type: TrackType.ROAD,
+    },
+  ],
+});
+const T_JUNCTION_ROAD: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.NONE,
+  trackDefinitions: [
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.ROAD,
+    },
+  ],
+});
+const FOUR_WAY_CROSS_ROAD: Piece = new Piece({
+  useInternalTracks: true,
+  internalNodeType: InternalNodeType.NONE,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.EAST,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.SOUTH,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.WEST,
+      type: TrackType.ROAD,
+    },
+  ],
+});
+const DOUBLE_TURN_ROAD: Piece = new Piece({
+  useInternalTracks: false,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      endPoint: Direction.WEST,
+      type: TrackType.ROAD,
+    },
+    {
+      startPoint: Direction.EAST,
+      endPoint: Direction.SOUTH,
+      type: TrackType.ROAD,
+    },
+  ],
+});
+const TURN_ROAD: Piece = new Piece({
+  useInternalTracks: false,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      endPoint: Direction.WEST,
+      type: TrackType.ROAD,
+    },
+  ],
+});
+const DOUBLE_TURN_RAIL: Piece = new Piece({
+  useInternalTracks: false,
+  trackDefinitions: [
+    {
+      startPoint: Direction.NORTH,
+      endPoint: Direction.WEST,
+      type: TrackType.RAIL,
+    },
+    {
+      startPoint: Direction.EAST,
+      endPoint: Direction.SOUTH,
+      type: TrackType.RAIL,
+    },
+  ],
+});
+
+export enum PieceId {
+  P01 = "P01",
+  P02 = "P02",
+  P03 = "P03",
+  P04 = "P04",
+  P05 = "P05",
+  P06 = "P06",
+  P07 = "P07",
+  P08 = "P08",
+  P09 = "P09",
+  P10 = "P10",
+  P11 = "P11",
+  P12 = "P12",
+  P13 = "P13",
+  P14 = "P14",
+  P15 = "P15",
+  P16 = "P16",
+  P17 = "P17",
+  P18 = "P18",
+  P19 = "P19",
+  P20 = "P20",
+  P21 = "P21",
+  P22 = "P22",
+}
+
+export const pieceMap: Record<PieceId, Piece> = {
+  [PieceId.P01]: STRAIGHT_RAIL,
+  [PieceId.P02]: TURN_RAIL,
+  [PieceId.P03]: FOUR_WAY_CROSS_RAIL,
+  [PieceId.P04]: T_JUNCTION_RAIL,
+  [PieceId.P05]: DEAD_END_STATION_RAIL,
+  [PieceId.P06]: TURN_RAIL_TO_ROAD,
+  [PieceId.P07]: T_JUNCTION_WITH_ROAD_ON_SIDE,
+  [PieceId.P08]: FOUR_WAY_WITH_ONE_ROAD,
+  [PieceId.P09]: T_JUNCTION_WITH_ROAD_AT_CENTER,
+  [PieceId.P10]: STRAIGHT_TRACK_CHANGE,
+  [PieceId.P11]: DEAD_END_STATION_ROAD,
+  [PieceId.P12]: T_JUNCTION_WITH_RAIL_AT_CENTER,
+  [PieceId.P13]: FOUR_WAY_PERPENDICULAR_CROSSING,
+  [PieceId.P14]: FOUR_WAY_WITH_ONE_RAIL,
+  [PieceId.P15]: FOUR_WAY_TURNING_CROSSING,
+  [PieceId.P16]: LEVEL_CROSSING,
+  [PieceId.P17]: STRAIGHT_ROAD,
+  [PieceId.P18]: T_JUNCTION_ROAD,
+  [PieceId.P19]: FOUR_WAY_CROSS_ROAD,
+  [PieceId.P20]: DOUBLE_TURN_ROAD,
+  [PieceId.P21]: TURN_ROAD,
+  [PieceId.P22]: DOUBLE_TURN_RAIL,
+};
--- a/interface/index.ts
+++ b/interface/index.ts
@ -1,6 +1,20 @@
+export * from "./constants/CellType";
+export * from "./constants/Direction";
+export * from "./constants/ExitType";
+export * from "./constants/InternalNodeType";
+export * from "./constants/Pieces";
 export * from "./constants/TrackType";
+export * from "./types/Border";
+export * from "./types/Cell";
+export * from "./types/Exit";
+export * from "./types/ExternalNode";
+export * from "./types/InternalNode";
+export * from "./types/Piece";
+export * from "./types/PlacedPiece";
+export * from "./BoardBuilder";
 export * from "./server-events/ServerError";
 export * from "./server-events/ServerEvent";
+export * from "./server-events/StartRoundEvent";
 export * from "./server-events/UpdateLobbyEvent";
 export * from "./client-events/ClientEvent";
 export * from "./client-events/CreateLobbyEvent";
--- a/interface/package-lock.json
+++ b/interface/package-lock.json
@ -10,7 +10,8 @@
      "license": "ISC",
      "dependencies": {
        "socket.io": "^4.8.1",
-        "socket.io-client": "^4.8.1"
+        "socket.io-client": "^4.8.1",
+        "uuid": "^11.0.3"
      },
      "devDependencies": {
        "@eslint/js": "^8.0.0",
@ -271,17 +272,17 @@
      }
    },
    "node_modules/@typescript-eslint/eslint-plugin": {
-      "version": "8.15.0",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.15.0.tgz",
-      "integrity": "sha512-+zkm9AR1Ds9uLWN3fkoeXgFppaQ+uEVtfOV62dDmsy9QCNqlRHWNEck4yarvRNrvRcHQLGfqBNui3cimoz8XAg==",
+      "version": "8.17.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.17.0.tgz",
+      "integrity": "sha512-HU1KAdW3Tt8zQkdvNoIijfWDMvdSweFYm4hWh+KwhPstv+sCmWb89hCIP8msFm9N1R/ooh9honpSuvqKWlYy3w==",
      "dev": true,
      "license": "MIT",
      "dependencies": {
        "@eslint-community/regexpp": "^4.10.0",
-        "@typescript-eslint/scope-manager": "8.15.0",
-        "@typescript-eslint/type-utils": "8.15.0",
-        "@typescript-eslint/utils": "8.15.0",
-        "@typescript-eslint/visitor-keys": "8.15.0",
+        "@typescript-eslint/scope-manager": "8.17.0",
+        "@typescript-eslint/type-utils": "8.17.0",
+        "@typescript-eslint/utils": "8.17.0",
+        "@typescript-eslint/visitor-keys": "8.17.0",
        "graphemer": "^1.4.0",
        "ignore": "^5.3.1",
        "natural-compare": "^1.4.0",
@ -305,16 +306,16 @@
      }
    },
    "node_modules/@typescript-eslint/parser": {
-      "version": "8.15.0",
-      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-8.15.0.tgz",
-      "integrity": "sha512-7n59qFpghG4uazrF9qtGKBZXn7Oz4sOMm8dwNWDQY96Xlm2oX67eipqcblDj+oY1lLCbf1oltMZFpUso66Kl1A==",
+      "version": "8.17.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-8.17.0.tgz",
+      "integrity": "sha512-Drp39TXuUlD49F7ilHHCG7TTg8IkA+hxCuULdmzWYICxGXvDXmDmWEjJYZQYgf6l/TFfYNE167m7isnc3xlIEg==",
      "dev": true,
      "license": "BSD-2-Clause",
      "dependencies": {
-        "@typescript-eslint/scope-manager": "8.15.0",
-        "@typescript-eslint/types": "8.15.0",
-        "@typescript-eslint/typescript-estree": "8.15.0",
-        "@typescript-eslint/visitor-keys": "8.15.0",
+        "@typescript-eslint/scope-manager": "8.17.0",
+        "@typescript-eslint/types": "8.17.0",
+        "@typescript-eslint/typescript-estree": "8.17.0",
+        "@typescript-eslint/visitor-keys": "8.17.0",
        "debug": "^4.3.4"
      },
      "engines": {
@ -334,14 +335,14 @@
      }
    },
    "node_modules/@typescript-eslint/scope-manager": {
-      "version": "8.15.0",
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@ -352,14 +353,14 @@
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@ -451,13 +452,13 @@
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@ -1232,9 +1233,9 @@
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@ -1958,9 +1959,9 @@
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+      "version": "1.4.3",
+      "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-1.4.3.tgz",
+      "integrity": "sha512-i3eMG77UTMD0hZhgRS562pv83RC6ukSAC2GMNWc+9dieh/+jDM5u5YG+NHX6VNDRHQcHwmsTHctP9LhbC3WxVw==",
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@ -2043,6 +2044,217 @@
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+        "graphemer": "^1.4.0",
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+        "natural-compare": "^1.4.0",
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+      "dependencies": {
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+        "@typescript-eslint/typescript-estree": "8.15.0"
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+    "node_modules/typescript-eslint/node_modules/@typescript-eslint/visitor-keys": {
+      "version": "8.15.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/visitor-keys/-/visitor-keys-8.15.0.tgz",
+      "integrity": "sha512-h8vYOulWec9LhpwfAdZf2bjr8xIp0KNKnpgqSz0qqYYKAW/QZKw3ktRndbiAtUz4acH4QLQavwZBYCc0wulA/Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@typescript-eslint/types": "8.15.0",
+        "eslint-visitor-keys": "^4.2.0"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/typescript-eslint"
+      }
+    },
+    "node_modules/typescript-eslint/node_modules/eslint-visitor-keys": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-4.2.0.tgz",
+      "integrity": "sha512-UyLnSehNt62FFhSwjZlHmeokpRK59rcz29j+F1/aDgbkbRTk7wIc9XzdoasMUbRNKDM0qQt/+BJ4BrpFeABemw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
    "node_modules/undici-types": {
      "version": "6.19.8",
      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.19.8.tgz",
@ -2058,6 +2270,19 @@
        "punycode": "^2.1.0"
      }
    },
+    "node_modules/uuid": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-11.0.3.tgz",
+      "integrity": "sha512-d0z310fCWv5dJwnX1Y/MncBAqGMKEzlBb1AOf7z9K8ALnd0utBX/msg/fA0+sbyN1ihbMsLhrBlnl1ak7Wa0rg==",
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist/esm/bin/uuid"
+      }
+    },
    "node_modules/vary": {
      "version": "1.1.2",
      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
--- a/interface/package.json
+++ b/interface/package.json
@ -23,6 +23,7 @@
    "typescript-eslint": "^8.15.0"
  },
  "dependencies": {
+    "uuid": "^11.0.3",
    "socket.io": "^4.8.1",
    "socket.io-client": "^4.8.1"
  }
--- a/interface/server-events/StartRoundEvent.ts
+++ b/interface/server-events/StartRoundEvent.ts
@ -0,0 +1,22 @@
+import { Socket as ServerSocket } from "socket.io";
+import { Socket as ClientSocket } from "socket.io-client";
+import { ServerEvent } from "./ServerEvent";
+import { PieceId } from "../constants/Pieces";
+
+export type StartRoundEvent = {
+  pieceIds: PieceId[];
+};
+
+export const emitStartRoundEvent = (
+  socket: ServerSocket,
+  payload: StartRoundEvent,
+) => {
+  socket.emit(ServerEvent.START_ROUND, payload);
+};
+
+export function attachHandlerToStartRoundEvent(
+  socket: ClientSocket,
+  handler: (event: StartRoundEvent) => void,
+): void {
+  socket.once(ServerEvent.START_ROUND, handler);
+}
--- a/interface/server-events/UpdateLobbyEvent.ts
+++ b/interface/server-events/UpdateLobbyEvent.ts
@ -1,14 +1,22 @@
-import { Socket } from "socket.io-client";
+import { Socket as ServerSocket } from "socket.io";
+import { Socket as ClientSocket } from "socket.io-client";
 import { ServerEvent } from "./ServerEvent";

 export type UpdateLobbyEvent = {
  playerNames: Array<string>;
+  gameCode: string;
+};
+
+export const emitUpdateLobbyEvent = (
+  socket: ServerSocket,
+  payload: UpdateLobbyEvent,
+) => {
+  socket.emit(ServerEvent.LOBBY_UPDATE, payload);
 };

 export function attachHandlerToUpdateLobbyEvent(
-  socket: Socket,
+  socket: ClientSocket,
  handler: (event: UpdateLobbyEvent) => void,
-): () => void {
-  socket.on(ServerEvent.LOBBY_UPDATE, handler);
-  return () => socket.off(ServerEvent.LOBBY_UPDATE, handler);
+): void {
+  socket.once(ServerEvent.LOBBY_UPDATE, handler);
 }
--- a/interface/types/Border.ts
+++ b/interface/types/Border.ts
@ -0,0 +1,22 @@
+import { Exit } from "./Exit";
+import { ExternalNode } from "./ExternalNode";
+
+export class Border {
+  private readonly firstNode: ExternalNode;
+  private readonly secondNode: ExternalNode | Exit;
+
+  constructor(firstNode: ExternalNode, secondNode: ExternalNode | Exit) {
+    this.firstNode = firstNode;
+    this.secondNode = secondNode;
+  }
+
+  public traverseFrom(node: ExternalNode): ExternalNode | Exit {
+    if (node === this.firstNode) {
+      return this.secondNode;
+    }
+    if (node === this.secondNode) {
+      return this.firstNode;
+    }
+    throw Error("Unable to traverse border");
+  }
+}
--- a/interface/types/Cell.ts
+++ b/interface/types/Cell.ts
@ -0,0 +1,112 @@
+import { CellType } from "../constants/CellType";
+import { Direction } from "../constants/Direction";
+import { ExitType } from "../constants/ExitType";
+import { PieceId, pieceMap } from "../constants/Pieces";
+import { Exit } from "./Exit";
+import { ExternalNode } from "./ExternalNode";
+import { InternalNode } from "./InternalNode";
+import { Piece } from "./Piece";
+import { PlacedPiece } from "./PlacedPiece";
+
+export class Cell {
+  public readonly externalNodes: Map<Direction, ExternalNode>;
+  public readonly cellType: CellType;
+  public placedPiece?: {
+    piece: PlacedPiece;
+    id: PieceId;
+  };
+
+  constructor(cellType: CellType) {
+    this.externalNodes = new Map([
+      [Direction.NORTH, new ExternalNode(this, Direction.NORTH)],
+      [Direction.SOUTH, new ExternalNode(this, Direction.SOUTH)],
+      [Direction.EAST, new ExternalNode(this, Direction.EAST)],
+      [Direction.WEST, new ExternalNode(this, Direction.WEST)],
+    ]);
+    this.cellType = cellType;
+  }
+
+  public getNodeAt(direction: Direction): ExternalNode {
+    const node = this.externalNodes.get(direction);
+    if (!node) throw Error(`Could not find node at ${direction}`);
+    return node!;
+  }
+
+  /**
+   * @param rotation in degrees counter-clockwise
+   */
+  public placePiece(pieceId: PieceId, rotation: 0 | 90 | 180 | 270) {
+    if (this.placedPiece !== undefined) return;
+    const piece: Piece = pieceMap[pieceId].rotate(rotation);
+
+    this.validatePiecePlacement(piece);
+
+    this.placedPiece = {
+      piece: piece.toPlacedPiece(this),
+      id: pieceId,
+    };
+  }
+
+  private validatePiecePlacement(piece: Piece) {
+    const hasAnyConnection = Array.from(piece.tracks)
+      .map((track) => {
+        const trackExternalNodes = [
+          this.getNodeAt(track.joinedPoints.firstPoint),
+        ];
+        if (!(track.joinedPoints.secondPoint instanceof InternalNode)) {
+          trackExternalNodes.push(
+            this.getNodeAt(track.joinedPoints.secondPoint),
+          );
+        }
+        return {
+          trackExternalNodes: trackExternalNodes,
+          trackType: track.type,
+        };
+      })
+      .reduce((isConnected, { trackExternalNodes, trackType }) => {
+        let isTrackConnected: boolean = false;
+        trackExternalNodes
+          .filter((node) => node.traverseBorder() instanceof Exit)
+          .forEach((node) => {
+            const exitType = (node.traverseBorder() as Exit).type;
+            isTrackConnected = true;
+            if (
+              exitType !== ExitType.AMBIVALENT &&
+              exitType.toString() !== trackType.toString()
+            ) {
+              throw Error(
+                `Unable to place piece, invalid exit type at direction ${node.direction}`,
+              );
+            }
+          });
+
+        trackExternalNodes
+          .filter((node) => node.traverseBorder() instanceof ExternalNode)
+          .forEach((node) => {
+            const adjacentExternalNode = node.traverseBorder() as ExternalNode;
+            const adjacentTrack =
+              adjacentExternalNode.cell.placedPiece?.piece.findTrackForDirection(
+                adjacentExternalNode.direction,
+              );
+            if (adjacentTrack !== undefined) {
+              isTrackConnected = true;
+              if (adjacentTrack.type !== trackType) {
+                throw Error(
+                  `Unable to place piece next to another due to conflicting track types at ${node.direction}`,
+                );
+              }
+            }
+          });
+
+        return isConnected || isTrackConnected;
+      }, false);
+
+    if (!hasAnyConnection) {
+      throw Error("No adjacent exit or piece available to connect to");
+    }
+  }
+
+  public removePiece() {
+    this.placedPiece = undefined;
+  }
+}
--- a/interface/types/Exit.ts
+++ b/interface/types/Exit.ts
@ -0,0 +1,9 @@
+import { ExitType } from "../constants/ExitType";
+
+export class Exit {
+  public readonly type: ExitType;
+
+  constructor(type: ExitType) {
+    this.type = type;
+  }
+}
--- a/interface/types/ExternalNode.ts
+++ b/interface/types/ExternalNode.ts
@ -0,0 +1,29 @@
+import { Direction } from "../constants/Direction";
+import { Border } from "./Border";
+import { Cell } from "./Cell";
+import { Exit } from "./Exit";
+
+export class ExternalNode {
+  public readonly direction: Direction;
+  private border?: Border;
+  public readonly cell: Cell;
+
+  constructor(cell: Cell, direction: Direction) {
+    this.cell = cell;
+    this.direction = direction;
+  }
+
+  public linkToNode(other: ExternalNode | Exit) {
+    this.border = new Border(this, other);
+    if (other instanceof ExternalNode) {
+      other.border = this.border;
+    }
+  }
+
+  public traverseBorder(): ExternalNode | Exit {
+    if (!this.border) {
+      throw Error(`Missing border for node`);
+    }
+    return this.border.traverseFrom(this);
+  }
+}
--- a/interface/types/InternalNode.ts
+++ b/interface/types/InternalNode.ts
@ -0,0 +1,12 @@
+import { v4 as uuidv4 } from "uuid";
+import { InternalNodeType } from "../constants/InternalNodeType";
+
+export class InternalNode {
+  id: string;
+  type: InternalNodeType;
+
+  constructor(type: InternalNodeType) {
+    this.id = uuidv4();
+    this.type = type;
+  }
+}
--- a/interface/types/Piece.ts
+++ b/interface/types/Piece.ts
@ -0,0 +1,115 @@
+import { Direction, rotateDirection } from "../constants/Direction";
+import { TrackType } from "../constants/TrackType";
+import { Cell } from "./Cell";
+import { InternalNode } from "./InternalNode";
+import { PlacedPiece } from "./PlacedPiece";
+import { InternalNodeType } from "../constants/InternalNodeType";
+
+export interface PieceProps {
+  readonly useInternalTracks: boolean;
+  readonly internalNodeType?: InternalNodeType;
+  readonly trackDefinitions: {
+    readonly startPoint: Direction;
+    readonly endPoint?: Direction;
+    readonly type: TrackType;
+  }[];
+}
+
+type Track = {
+  readonly joinedPoints: {
+    readonly firstPoint: Direction;
+    readonly secondPoint: Direction | InternalNode;
+  };
+  readonly type: TrackType;
+};
+
+export class Piece {
+  readonly tracks: Set<Track>;
+  readonly internalNode?: InternalNode;
+
+  constructor(pieceProps: PieceProps) {
+    if (pieceProps.useInternalTracks) {
+      if (!pieceProps.internalNodeType) {
+        throw Error(
+          "Expected to find internal node type when useInternalTracks is set",
+        );
+      }
+      this.internalNode = new InternalNode(pieceProps.internalNodeType);
+      this.tracks = new Set(
+        pieceProps.trackDefinitions.map((trackDefinition) => {
+          return {
+            joinedPoints: {
+              firstPoint: trackDefinition.startPoint,
+              secondPoint: this.internalNode!,
+            },
+            type: trackDefinition.type,
+          };
+        }),
+      );
+    } else {
+      this.internalNode = undefined;
+      this.tracks = new Set(
+        pieceProps.trackDefinitions.map((trackDefinition) => {
+          if (!trackDefinition.endPoint) {
+            throw Error("Missing end point for non-internal track");
+          }
+          return {
+            joinedPoints: {
+              firstPoint: trackDefinition.startPoint,
+              secondPoint: trackDefinition.endPoint,
+            },
+            type: trackDefinition.type,
+          };
+        }),
+      );
+    }
+  }
+
+  rotate(rotation: 0 | 90 | 180 | 270): Piece {
+    return new Piece({
+      useInternalTracks: this.internalNode !== undefined,
+      internalNodeType: this.internalNode?.type,
+      trackDefinitions: Array.from(this.tracks).map((track) => {
+        if (track.joinedPoints.secondPoint instanceof InternalNode) {
+          return {
+            type: track.type,
+            startPoint: rotateDirection(
+              track.joinedPoints.firstPoint,
+              rotation,
+            ),
+          };
+        } else {
+          return {
+            type: track.type,
+            startPoint: rotateDirection(
+              track.joinedPoints.firstPoint,
+              rotation,
+            ),
+            endPoint: rotateDirection(track.joinedPoints.secondPoint, rotation),
+          };
+        }
+      }),
+    });
+  }
+
+  toPlacedPiece(cell: Cell) {
+    return new PlacedPiece(
+      new Set(
+        Array.from(this.tracks).map((track) => {
+          return {
+            nodes: {
+              firstNode: cell.getNodeAt(track.joinedPoints.firstPoint),
+              secondNode:
+                track.joinedPoints.secondPoint instanceof InternalNode
+                  ? (track.joinedPoints.secondPoint as InternalNode)
+                  : cell.getNodeAt(track.joinedPoints.secondPoint as Direction),
+            },
+            type: track.type,
+          };
+        }),
+      ),
+      this.internalNode,
+      cell,
+    );
+  }
+}
--- a/interface/types/PlacedPiece.ts
+++ b/interface/types/PlacedPiece.ts
@ -0,0 +1,41 @@
+import { Direction } from "../constants/Direction";
+import { TrackType } from "../constants/TrackType";
+import { Cell } from "./Cell";
+import { ExternalNode } from "./ExternalNode";
+import { InternalNode } from "./InternalNode";
+
+export class PlacedPiece {
+  tracks: Set<{
+    nodes: {
+      firstNode: ExternalNode;
+      secondNode: ExternalNode | InternalNode;
+    };
+    type: TrackType;
+  }>;
+  internalNode?: InternalNode;
+  cell: Cell;
+  constructor(
+    tracks: Set<{
+      nodes: {
+        firstNode: ExternalNode;
+        secondNode: ExternalNode | InternalNode;
+      };
+      type: TrackType;
+    }>,
+    internalNodes: InternalNode | undefined,
+    cell: Cell,
+  ) {
+    this.tracks = tracks;
+    this.internalNode = internalNodes;
+    this.cell = cell;
+  }
+
+  public findTrackForDirection(direction: Direction) {
+    return Array.from(this.tracks).find(
+      (track) =>
+        track.nodes.firstNode.direction === direction ||
+        (track.nodes.secondNode instanceof ExternalNode &&
+          track.nodes.secondNode.direction === direction),
+    );
+  }
+}
--- a/web/package-lock.json
+++ b/web/package-lock.json
@ -13,7 +13,7 @@
        "@testing-library/react": "^13.4.0",
        "@testing-library/user-event": "^13.5.0",
        "@types/jest": "^27.5.2",
-        "@types/node": "^16.18.119",
+        "@types/node": "^17.0.29",
        "@types/react": "^18.3.12",
        "@types/react-dom": "^18.3.1",
        "interface": "file:../interface",
@ -39,7 +39,8 @@
      "license": "ISC",
      "dependencies": {
        "socket.io": "^4.8.1",
-        "socket.io-client": "^4.8.1"
+        "socket.io-client": "^4.8.1",
+        "uuid": "^11.0.3"
      },
      "devDependencies": {
        "@eslint/js": "^8.0.0",
@ -4201,9 +4202,9 @@
      "license": "MIT"
    },
    "node_modules/@types/node": {
-      "version": "16.18.119",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-16.18.119.tgz",
-      "integrity": "sha512-ia7V9a2FnhUFfetng4/sRPBMTwHZUkPFY736rb1cg9AgG7MZdR97q7/nLR9om+sq5f1la9C857E0l/nrI0RiFQ==",
+      "version": "17.0.29",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-17.0.29.tgz",
+      "integrity": "sha512-tx5jMmMFwx7wBwq/V7OohKDVb/JwJU5qCVkeLMh1//xycAJ/ESuw9aJ9SEtlCZDYi2pBfe4JkisSoAtbOsBNAA==",
      "license": "MIT"
    },
    "node_modules/@types/node-forge": {
--- a/web/package.json
+++ b/web/package.json
@ -8,7 +8,7 @@
    "@testing-library/react": "^13.4.0",
    "@testing-library/user-event": "^13.5.0",
    "@types/jest": "^27.5.2",
-    "@types/node": "^16.18.119",
+    "@types/node": "^17.0.29",
    "@types/react": "^18.3.12",
    "@types/react-dom": "^18.3.1",
    "interface": "file:../interface",
--- a/web/public/clean-icon.png
+++ b/web/public/clean-icon.png
--- a/web/public/commit-icon.png
+++ b/web/public/commit-icon.png
--- a/web/public/factory-icon.png
+++ b/web/public/factory-icon.png
--- a/web/public/house-icon.png
+++ b/web/public/house-icon.png
--- a/web/public/pieces/P01.jpeg
+++ b/web/public/pieces/P01.jpeg
--- a/web/public/pieces/P02.jpeg
+++ b/web/public/pieces/P02.jpeg
--- a/web/public/pieces/P03.jpeg
+++ b/web/public/pieces/P03.jpeg
--- a/web/public/pieces/P04.jpeg
+++ b/web/public/pieces/P04.jpeg
--- a/web/public/pieces/P05.jpeg
+++ b/web/public/pieces/P05.jpeg
--- a/web/public/pieces/P06.jpeg
+++ b/web/public/pieces/P06.jpeg
--- a/web/public/pieces/P07.jpeg
+++ b/web/public/pieces/P07.jpeg
--- a/web/public/pieces/P08.jpeg
+++ b/web/public/pieces/P08.jpeg
--- a/web/public/pieces/P09.jpeg
+++ b/web/public/pieces/P09.jpeg
--- a/web/public/pieces/P10.jpeg
+++ b/web/public/pieces/P10.jpeg
--- a/web/public/pieces/P11.jpeg
+++ b/web/public/pieces/P11.jpeg
--- a/web/public/pieces/P12.jpeg
+++ b/web/public/pieces/P12.jpeg
--- a/web/public/pieces/P13.jpeg
+++ b/web/public/pieces/P13.jpeg
--- a/web/public/pieces/P14.jpeg
+++ b/web/public/pieces/P14.jpeg
--- a/web/public/pieces/P15.jpeg
+++ b/web/public/pieces/P15.jpeg
--- a/web/public/pieces/P16.jpeg
+++ b/web/public/pieces/P16.jpeg
--- a/web/public/pieces/P17.jpeg
+++ b/web/public/pieces/P17.jpeg
--- a/web/public/pieces/P18.jpeg
+++ b/web/public/pieces/P18.jpeg
--- a/web/public/pieces/P19.jpeg
+++ b/web/public/pieces/P19.jpeg
--- a/web/public/pieces/P20.jpeg
+++ b/web/public/pieces/P20.jpeg
--- a/web/public/pieces/P21.jpeg
+++ b/web/public/pieces/P21.jpeg
--- a/web/public/pieces/P22.jpeg
+++ b/web/public/pieces/P22.jpeg
--- a/web/public/rotate-icon.png
+++ b/web/public/rotate-icon.png
--- a/web/public/university-icon.png
+++ b/web/public/university-icon.png
--- a/web/src/App.tsx
+++ b/web/src/App.tsx
@ -1,15 +1,55 @@
-import React from "react";
+import React, { useCallback, useState } from "react";
 import { Socket } from "socket.io-client";
 import LandingPage from "./pages/landing/LandingPage";
+import GamePage from "./pages/game/GamePage";
+import LobbyPage from "./pages/lobby/LobbyPage";
+import {
+  attachHandlerToStartRoundEvent,
+  attachHandlerToUpdateLobbyEvent,
+  PieceId,
+} from "interface";

 export interface AppProps {
  socket: Socket;
 }

 const App = (props: AppProps) => {
+  const { socket } = props;
+  const [renderedPage, setRenderedPage] = useState("LANDING");
+
+  const [initialPlayerNames, setInitialPlayerNames] = useState([] as string[]);
+  const [gameCode, setGameCode] = useState("");
+  const [initialPieceIds, setInitialPieceIds] = useState([] as PieceId[]);
+
+  const setupNextPageTransition = useCallback(() => {
+    if (renderedPage === "LANDING") {
+      attachHandlerToUpdateLobbyEvent(socket, (event) => {
+        setInitialPlayerNames(event.playerNames);
+        setGameCode(event.gameCode);
+        setRenderedPage("LOBBY");
+      });
+    } else if (renderedPage === "LOBBY") {
+      attachHandlerToStartRoundEvent(socket, (event) => {
+        setInitialPieceIds(event.pieceIds);
+        setRenderedPage("GAME");
+      });
+    }
+  }, [renderedPage]);
+
+  setupNextPageTransition();
  return (
    <div className="app">
-      <LandingPage {...props} />
+      {renderedPage === "LANDING" && <LandingPage {...props} />}
+      {renderedPage === "LOBBY" && (
+        <LobbyPage
+          {...props}
+          initialPlayerNames={initialPlayerNames}
+          gameCode={gameCode}
+        />
+      )}
+      {renderedPage === "GAME" && (
+        <GamePage initialPieceIds={initialPieceIds} />
+      )}
    </div>
  );
 };
--- a/web/src/pages/game/GamePage.scss
+++ b/web/src/pages/game/GamePage.scss
@ -0,0 +1,17 @@
+h1 {
+    text-align: center;
+    padding: 10px;
+    margin: 0;
+}
+
+.game-panel {
+    user-select: none; /* Standard syntax */
+    display: flex;
+    flex-direction: row;
+
+    .right-panel {
+        display: flex;
+        flex-direction: column;
+        padding: 50px;
+    }
+}
--- a/web/src/pages/game/GamePage.tsx
+++ b/web/src/pages/game/GamePage.tsx
@ -0,0 +1,134 @@
+import React, { useState } from "react";
+import GameBoard from "./components/GameBoard";
+import DiceSet from "./components/DiceSet";
+import "./GamePage.scss";
+import { buildBoard, PieceId } from "interface";
+import { DieViewProps } from "./types/DieViewProps";
+import { PlacePieceActionStack } from "./types/PlacePieceActionStack";
+
+export interface GamePageProps {
+  initialPieceIds: PieceId[];
+}
+
+const GamePage = (props: GamePageProps) => {
+  const { initialPieceIds } = props;
+
+  const [pieceIds] = useState(initialPieceIds);
+
+  const getDiceSet: () => DieViewProps[] = () =>
+    pieceIds.map((pieceId) => {
+      return {
+        pieceId: pieceId,
+        isSelected: false,
+        isDisabled: false,
+        isSpecial: false,
+        rotation: 0,
+      };
+    });
+
+  const [dice, setDice] = useState(getDiceSet());
+  const [specialDice, setSpecialDice] = useState(
+    [
+      PieceId.P03,
+      PieceId.P08,
+      PieceId.P13,
+      PieceId.P14,
+      PieceId.P15,
+      PieceId.P19,
+    ].map((pieceId) => {
+      return {
+        pieceId: pieceId,
+        isSelected: false,
+        isDisabled: false,
+        isSpecial: true,
+        rotation: 0,
+      };
+    }),
+  );
+  const [specialDieUsedInRound, setSpecialDieUsedInRound] = useState(false);
+
+  const modifyDieState = (
+    matcher: (die: DieViewProps) => boolean,
+    newStateComputer: (die: DieViewProps) => Partial<DieViewProps>,
+  ) => {
+    setDice(
+      dice.map((die) => {
+        if (!matcher(die)) return die;
+        return {
+          ...die,
+          ...newStateComputer(die),
+        };
+      }),
+    );
+    setSpecialDice(
+      specialDice.map((die) => {
+        if (!matcher(die)) return die;
+        return {
+          ...die,
+          ...newStateComputer(die),
+        };
+      }),
+    );
+  };
+
+  const fetchDie = (matcher: (die: DieViewProps) => boolean) => {
+    return dice.concat(specialDice).find((die) => matcher(die));
+  };
+
+  const [board, setBoard] = useState(buildBoard());
+  const [id, setId] = useState(1);
+  const refreshBoardRender = () => {
+    setBoard(board);
+    setId(id + 1);
+  };
+
+  const [placePieceActionStack, setPlacePieceActionStack] = useState(
+    new PlacePieceActionStack(),
+  );
+  const resetBoard = () => {
+    placePieceActionStack.resetActions(board);
+    setBoard(board);
+    modifyDieState(
+      () => true,
+      () => {
+        return { isSelected: false, isDisabled: false };
+      },
+    );
+    setId(id + 1);
+  };
+  const commitBoard = () => {
+    if (dice.some((die) => !die.isDisabled)) return;
+    placePieceActionStack.commitActions();
+    setDice(getDiceSet());
+    setSpecialDieUsedInRound(false);
+  };
+
+  return (
+    <React.Fragment>
+      <h1>Game Page Title</h1>
+      <div className="game-panel" id={id.toString()}>
+        <GameBoard
+          modifyDieState={modifyDieState}
+          fetchDie={fetchDie}
+          setSpecialDieUsedInRound={setSpecialDieUsedInRound}
+          refreshBoardRender={refreshBoardRender}
+          board={board}
+          placePieceActionStack={placePieceActionStack}
+          setPlacePieceActionStack={setPlacePieceActionStack}
+        />
+        <div className="right-panel">
+          <DiceSet
+            dice={dice}
+            specialDice={specialDice}
+            modifyDieState={modifyDieState}
+            specialDieUsedInRound={specialDieUsedInRound}
+            resetBoard={resetBoard}
+            commitBoard={commitBoard}
+          />
+        </div>
+      </div>
+    </React.Fragment>
+  );
+};
+
+export default GamePage;
--- a/web/src/pages/game/components/BoardCell.scss
+++ b/web/src/pages/game/components/BoardCell.scss
@ -0,0 +1,108 @@
+.cell {
+    width: 100px;
+    height: 100px;
+    border: 2px solid black;
+    border-radius: 10%;
+    position: relative;
+
+    .piece {
+        border-radius: 10%;
+        position: absolute;
+        top: 0;
+
+        &.rotate-90 {
+            transform: rotate(-90deg);
+        }
+
+        &.rotate-180 {
+            transform: rotate(180deg);
+        }
+
+        &.rotate-270 {
+            transform: rotate(90deg);
+        }
+    }
+
+    .cell-type-icon {
+        width: 25px;
+        height: 25px;
+        padding: 2px;
+        margin: 2px;
+        position: absolute;
+        top: 0;
+        left: 0;
+    }
+}
+
+.cell .exit {
+    position: absolute;
+    width: 20px;
+    height: 20px;
+
+    &:has(.exit-road) {
+        border: solid black;
+        border-width: 0 1px;
+
+        .exit-road {
+            margin: auto;
+            width: 0;
+            height: 100%;
+            border: dashed black;
+            border-width: 0 1px;
+            transform: translate(calc(50% - 1px));
+        }
+    }
+
+    &:has(.exit-rail) {
+        border-width: 0 1px;
+
+        .exit-rail {
+            margin: auto;
+            width: 0;
+            height: 100%;
+            border: solid black;
+            border-width: 0 1px;
+            transform: translate(calc(50% - 1px));
+        }
+    }
+
+    &:has(.exit-ambivalent) {
+        border-width: 0 1px;
+        border-style: dotted;
+
+        .exit-ambivalent {
+            margin: auto;
+            width: 0;
+            height: 100%;
+            border: dotted black;
+            border-width: 0 1px 0 0;
+            transform: translate(calc(50%));
+        }
+    }
+    &:has(.exit-north), &:has(.exit-south) {
+        left: 50%;
+    }
+
+    &:has(.exit-north) {
+        transform: translate(calc(-50% - 1px), -100%);
+    }
+
+    &:has(.exit-south) {
+        top: 100%;
+        transform: translate(calc(-50% - 1px), 0%);
+    }
+
+    &:has(.exit-east), &:has(.exit-west) {
+        top: 50%;
+    }
+
+    &:has(.exit-east) {
+        left: 100%;
+        transform: rotate(90deg) translate(-50%, 0);
+    }
+
+    &:has(.exit-west) {
+        left: 0%;
+        transform: rotate(90deg) translate(-50%, 100%);
+    }
+}
--- a/web/src/pages/game/components/BoardCell.tsx
+++ b/web/src/pages/game/components/BoardCell.tsx
@ -0,0 +1,85 @@
+import { Cell, CellType, directions, Exit, PieceId } from "interface";
+import "./BoardCell.scss";
+import { useState } from "react";
+import { DieViewProps } from "../types/DieViewProps";
+
+export interface BoardCellProps {
+  cell: Cell;
+  refreshBoardRender: () => void;
+  modifyDieState: (
+    matcher: (die: DieViewProps) => boolean,
+    newStateComputer: (die: DieViewProps) => Partial<DieViewProps>,
+  ) => void;
+  fetchDie: (
+    matcher: (die: DieViewProps) => boolean,
+  ) => DieViewProps | undefined;
+  setSpecialDieUsedInRound: React.Dispatch<React.SetStateAction<boolean>>;
+  placePieceActionHandler: (pieceId: PieceId, rotation: number) => void;
+}
+
+const BoardCell = (props: BoardCellProps) => {
+  const {
+    cell,
+    refreshBoardRender,
+    modifyDieState,
+    fetchDie,
+    setSpecialDieUsedInRound,
+    placePieceActionHandler,
+  } = props;
+  const [pieceRotationAngle, setPieceRotationAngle] = useState(0);
+  const handleBoardCellClick = () => {
+    const selectedDie = fetchDie((die) => die.isSelected);
+    if (!selectedDie) return;
+    try {
+      placePieceActionHandler(selectedDie.pieceId, selectedDie.rotation);
+    } catch (error) {
+      console.log(error);
+      return;
+    }
+    modifyDieState(
+      (die) => die === selectedDie,
+      () => {
+        return {
+          isSelected: false,
+          isDisabled: true,
+        };
+      },
+    );
+    if (selectedDie.isSpecial) setSpecialDieUsedInRound(true);
+    // Set rotation to the piece in the board, not the die
+    setPieceRotationAngle(selectedDie.rotation);
+    refreshBoardRender();
+  };
+
+  return (
+    <div className={"cell"} onClick={handleBoardCellClick}>
+      {directions.map((direction) => {
+        const traversedNode = cell.getNodeAt(direction).traverseBorder();
+        const isExit = traversedNode instanceof Exit;
+        if (!isExit) return;
+        const className =
+          `exit-${direction.toLowerCase()}` +
+          ` exit-${(traversedNode as Exit).type.toLowerCase()}`;
+        return (
+          <div className="exit">
+            <div className={className} />
+          </div>
+        );
+      })}
+      {cell.placedPiece && (
+        <img
+          className={`piece rotate-${pieceRotationAngle}`}
+          src={`pieces/${cell.placedPiece.id}.jpeg`}
+        ></img>
+      )}
+      {cell.cellType !== CellType.NORMAL && (
+        <img
+          className="cell-type-icon"
+          src={`./${cell.cellType.toLowerCase()}-icon.png`}
+        ></img>
+      )}
+    </div>
+  );
+};
+
+export default BoardCell;
--- a/web/src/pages/game/components/DiceSet.scss
+++ b/web/src/pages/game/components/DiceSet.scss
@ -0,0 +1,40 @@
+.dice-set-actions {
+    display: flex;
+    flex-direction: row;
+    width: max-content;
+    margin: auto auto 50px auto;
+
+    img {
+        border: 3px solid green;
+        box-shadow: 0 0 10px green;
+        border-radius: 20%;
+        padding: 5px;
+        width: 70px;
+        height: 70px;
+        margin-right: 10px;
+
+        &.icon-inverted {
+            transform: scaleX(-1);
+        }
+
+        &:last-child {
+            margin-right: 0;
+        }
+    }
+}
+
+.dice-set {
+    display: grid;
+    grid-template-columns: repeat(2, auto);
+    gap: 20px;
+    margin: 0 0 50px 0;
+}
+
+.special-dice-set {
+    display: grid;
+    grid-template-columns: repeat(3, auto);
+    margin: 0 0 50px 0;
+    column-gap: 12%;
+    row-gap: 20px;
+    width: 100%;
+}
--- a/web/src/pages/game/components/DiceSet.tsx
+++ b/web/src/pages/game/components/DiceSet.tsx
@ -0,0 +1,80 @@
+import "./DiceSet.scss";
+import Die from "./Die";
+import React from "react";
+import { DieViewProps } from "../types/DieViewProps";
+
+export interface DiceSetProps {
+  dice: DieViewProps[];
+  specialDice: DieViewProps[];
+  modifyDieState: (
+    matcher: (die: DieViewProps) => boolean,
+    newStateComputer: (die: DieViewProps) => Partial<DieViewProps>,
+  ) => void;
+  specialDieUsedInRound: boolean;
+  resetBoard: () => void;
+  commitBoard: () => void;
+}
+const DiceSet = (props: DiceSetProps) => {
+  const {
+    dice,
+    specialDice,
+    modifyDieState,
+    specialDieUsedInRound,
+    resetBoard,
+    commitBoard,
+  } = props;
+  const handleDieClick = (clickedDie: DieViewProps) => {
+    if (clickedDie.isDisabled) return;
+    const isSpecialDie = clickedDie.isSpecial;
+    if (isSpecialDie && specialDieUsedInRound) return;
+    modifyDieState(
+      () => true,
+      (die) => {
+        return {
+          isSelected: die === clickedDie,
+        };
+      },
+    );
+  };
+
+  const handleRotateButton = (rotation: number) => {
+    modifyDieState(
+      (die) => die.isSelected,
+      (die) => {
+        return {
+          rotation: (die.rotation + rotation + 360) % 360,
+        };
+      },
+    );
+  };
+
+  return (
+    <React.Fragment>
+      <div className="dice-set-actions">
+        <img
+          src="./rotate-icon.png"
+          onClick={() => handleRotateButton(-90)}
+        ></img>
+        <img
+          src="./rotate-icon.png"
+          className="icon-inverted"
+          onClick={() => handleRotateButton(90)}
+        ></img>
+        <img src="./clean-icon.png" onClick={resetBoard}></img>
+        <img src="./commit-icon.png" onClick={commitBoard}></img>
+      </div>
+      <div className="dice-set">
+        {dice.map((die) => (
+          <Die die={die} handleDieClick={handleDieClick} />
+        ))}
+      </div>
+      <div className="special-dice-set">
+        {specialDice.map((die) => (
+          <Die die={die} handleDieClick={handleDieClick} />
+        ))}
+      </div>
+    </React.Fragment>
+  );
+};
+
+export default DiceSet;
--- a/web/src/pages/game/components/Die.scss
+++ b/web/src/pages/game/components/Die.scss
@ -0,0 +1,37 @@
+.dice {
+    height: 150px;
+    width: 150px;
+    border: 2px solid black;
+    border-radius: 10%;
+
+    img{
+        border-radius: 10%;
+    }
+
+    &.selected {
+        box-shadow: 0 0 20px green;
+    }
+
+    &.disabled {
+        box-shadow: 0 0 20px grey;
+    }
+
+    &.rotate-90 {
+        transform: rotate(-90deg);
+    }
+
+    &.rotate-180 {
+        transform: rotate(180deg);
+    }
+
+    &.rotate-270 {
+        transform: rotate(90deg);
+    }
+
+    transition: transform 0.5s cubic-bezier(.47,1.64,.41,.8);
+}
+
+.special-dice-set .dice {
+    height: 80px;
+    width: 80px;
+}
--- a/web/src/pages/game/components/Die.tsx
+++ b/web/src/pages/game/components/Die.tsx
@ -0,0 +1,25 @@
+import "./Die.scss";
+import { DieViewProps } from "../types/DieViewProps";
+
+interface DieProps {
+  die: DieViewProps;
+  handleDieClick: (die: DieViewProps) => void;
+}
+
+const Die = (props: DieProps) => {
+  const { die, handleDieClick } = props;
+  const { pieceId, isSelected, isDisabled, rotation } = die;
+  const className =
+    "dice" +
+    (isSelected ? " selected" : "") +
+    (isDisabled ? " disabled" : "") +
+    ` rotate-${rotation}`;
+
+  return (
+    <div className={className} onClick={() => handleDieClick(die)}>
+      <img src={`pieces/${pieceId}.jpeg`}></img>
+    </div>
+  );
+};
+
+export default Die;
--- a/web/src/pages/game/components/GameBoard.scss
+++ b/web/src/pages/game/components/GameBoard.scss
@ -0,0 +1,10 @@
+.game-board {
+    height: 850px;
+    width: 850px;
+    min-height: 850px;
+    min-width: 850px;
+    display: grid;
+    grid-template-columns: repeat(7, auto);
+    gap: auto;
+    padding: 50px;
+}
--- a/web/src/pages/game/components/GameBoard.tsx
+++ b/web/src/pages/game/components/GameBoard.tsx
@ -0,0 +1,49 @@
+import { Cell } from "interface";
+import "./GameBoard.scss";
+import BoardCell from "./BoardCell";
+import { DieViewProps } from "../types/DieViewProps";
+import { PlacePieceActionStack } from "../types/PlacePieceActionStack";
+import { PlacePieceAction } from "../types/PlacePieceAction";
+
+export interface GameBoardProps {
+  modifyDieState: (
+    matcher: (die: DieViewProps) => boolean,
+    newStateComputer: (die: DieViewProps) => Partial<DieViewProps>,
+  ) => void;
+  fetchDie: (
+    matcher: (die: DieViewProps) => boolean,
+  ) => DieViewProps | undefined;
+  setSpecialDieUsedInRound: React.Dispatch<React.SetStateAction<boolean>>;
+  refreshBoardRender: () => void;
+  board: Cell[][];
+  placePieceActionStack: PlacePieceActionStack;
+  setPlacePieceActionStack: React.Dispatch<
+    React.SetStateAction<PlacePieceActionStack>
+  >;
+}
+
+const GameBoard = (props: GameBoardProps) => {
+  const { board, placePieceActionStack, setPlacePieceActionStack } = props;
+
+  return (
+    <div className="game-board">
+      {board.flatMap((row, rowIndex) =>
+        row.map((cell, colIndex) => (
+          <BoardCell
+            {...props}
+            cell={cell}
+            placePieceActionHandler={(pieceId, rotation) => {
+              placePieceActionStack.executeAction(
+                new PlacePieceAction(pieceId, rotation, rowIndex, colIndex),
+                board,
+              );
+              setPlacePieceActionStack(placePieceActionStack);
+            }}
+          />
+        )),
+      )}
+    </div>
+  );
+};
+
+export default GameBoard;
--- a/web/src/pages/game/types/DieViewProps.ts
+++ b/web/src/pages/game/types/DieViewProps.ts
@ -0,0 +1,9 @@
+import { PieceId } from "interface";
+
+export interface DieViewProps {
+  pieceId: PieceId;
+  isSelected: boolean;
+  isDisabled: boolean;
+  readonly isSpecial: boolean;
+  rotation: number;
+}
--- a/web/src/pages/game/types/PlacePieceAction.ts
+++ b/web/src/pages/game/types/PlacePieceAction.ts
@ -0,0 +1,32 @@
+import { Cell, PieceId } from "interface";
+
+export class PlacePieceAction {
+  pieceId: PieceId;
+  rotation: number;
+  cell: {
+    row: number;
+    col: number;
+  };
+
+  constructor(pieceId: PieceId, rotation: number, row: number, col: number) {
+    this.pieceId = pieceId;
+    this.rotation = rotation;
+    this.cell = {
+      row: row,
+      col: col,
+    };
+  }
+
+  do(board: Cell[][]) {
+    const cell = board[this.cell.row][this.cell.col];
+    cell.placePiece(this.pieceId, this.rotation as 0 | 90 | 180 | 270);
+  }
+
+  undo(board: Cell[][]) {
+    const cell = board[this.cell.row][this.cell.col];
+    if (!cell.placedPiece || cell.placedPiece.id !== this.pieceId) {
+      throw Error("Un-doing action error");
+    }
+    cell.removePiece();
+  }
+}
--- a/web/src/pages/game/types/PlacePieceActionStack.ts
+++ b/web/src/pages/game/types/PlacePieceActionStack.ts
@ -0,0 +1,40 @@
+import { Cell } from "interface";
+import { PlacePieceAction } from "./PlacePieceAction";
+
+export class PlacePieceActionStack {
+  readonly committedActions: PlacePieceAction[] = [];
+  inProgressActions: PlacePieceAction[] = [];
+
+  executeAction(action: PlacePieceAction, board: Cell[][]) {
+    action.do(board);
+    this.inProgressActions.push(action);
+  }
+
+  undoLastAction(board: Cell[][]) {
+    const lastAction = this.inProgressActions.pop();
+    if (!lastAction) {
+      throw Error("No in progress action to undo");
+    }
+    lastAction.undo(board);
+  }
+
+  resetActions(board: Cell[][]) {
+    try {
+      while (true) {
+        this.undoLastAction(board);
+      }
+    } catch (error) {
+      if (
+        !(error instanceof Error) ||
+        error.message !== "No in progress action to undo"
+      ) {
+        throw error;
+      }
+    }
+  }
+
+  commitActions() {
+    this.committedActions.push(...this.inProgressActions);
+    this.inProgressActions = [];
+  }
+}
--- a/web/src/pages/lobby/LobbyPage.scss
+++ b/web/src/pages/lobby/LobbyPage.scss
@ -0,0 +1,50 @@
+.lobby-page {
+    height: 100%;
+    width: 100%;
+    padding: 2%;
+    margin: 0 auto;
+    text-align: center;
+
+    background: linear-gradient(-45deg, #03444a, #00a8a8, #f1bc52, #ff8f4b);
+    background-size: 400% 400%;
+    animation: gradient 15s ease infinite;
+    height: 100vh;
+
+    @keyframes gradient {
+        0% {
+            background-position: 0% 50%;
+        }
+        50% {
+            background-position: 100% 50%;
+        }
+        100% {
+            background-position: 0% 50%;
+        }
+    }
+
+    .lobby-page-body {
+        margin: auto;
+        width: 20%;
+        min-width: 300px;
+
+        .lobby-user-name {
+            margin: 0 auto 10px;
+            padding: 10px;
+            width: 60%;
+            border: 2px solid cyan;
+            border-radius: 10px;
+        }
+
+        .game-code {
+            margin: 0 auto 10px;
+            padding: 10px;
+            width: 60%;
+            border: 2px solid blue;
+            border-radius: 10px;
+        }
+
+        .start-game-button {
+            margin: 30px 0;
+        }
+    }
+}
--- a/web/src/pages/lobby/LobbyPage.tsx
+++ b/web/src/pages/lobby/LobbyPage.tsx
@ -0,0 +1,39 @@
+import { useState } from "react";
+import "./LobbyPage.scss";
+import { Socket } from "socket.io-client";
+import { attachHandlerToUpdateLobbyEvent, ClientEvent } from "interface";
+
+export interface LobbyPageProps {
+  initialPlayerNames: string[];
+  gameCode: string;
+  socket: Socket;
+}
+
+const LobbyPage = (props: LobbyPageProps) => {
+  const { initialPlayerNames, gameCode, socket } = props;
+  const [playerNames, setPlayerNames] = useState(initialPlayerNames);
+
+  attachHandlerToUpdateLobbyEvent(socket, (event) => {
+    setPlayerNames(event.playerNames);
+  });
+  const startGame = () => socket.emit(ClientEvent.START_GAME);
+
+  return (
+    <div className="lobby-page">
+      <div className="landing-page-title">
+        <h1>Trains And Roads</h1>
+      </div>
+      <div className="lobby-page-body">
+        {playerNames.map((name) => (
+          <article className="lobby-user-name">{name}</article>
+        ))}
+        <div className="start-game-button">
+          <button onClick={startGame}>Start Game</button>
+        </div>
+        <article className="game-code">Game code: {gameCode}</article>
+      </div>
+    </div>
+  );
+};
+
+export default LobbyPage;