diff --git a/apps/api/src/controllers/lobbyController.ts b/apps/api/src/controllers/lobbyController.ts
deleted file mode 100644
index 113c8c5..0000000
--- a/apps/api/src/controllers/lobbyController.ts
+++ /dev/null
@@ -1,37 +0,0 @@
-import type { Request, Response, NextFunction } from "express";
-import { createLobby, joinLobby } from "../services/lobbyService.js";
-
-export const createLobbyHandler = async (
-  req: Request,
-  res: Response,
-  next: NextFunction,
-) => {
-  try {
-    const userId = req.session!.user.id;
-    const lobby = await createLobby(userId);
-    res.json({ success: true, data: lobby });
-  } catch (error) {
-    next(error);
-  }
-};
-
-export const joinLobbyHandler = async (
-  req: Request,
-  res: Response,
-  next: NextFunction,
-) => {
-  try {
-    const userId = req.session!.user.id;
-    const code = req.params["code"];
-    if (!code) {
-      return next(new Error("Missing code param"));
-    }
-    if (typeof code !== "string") {
-      return next(new Error("Missing or invalid code param"));
-    }
-    const lobby = await joinLobby(code, userId);
-    res.json({ success: true, data: lobby });
-  } catch (error) {
-    next(error);
-  }
-};
diff --git a/apps/api/src/errors/AppError.ts b/apps/api/src/errors/AppError.ts
index 4677d9f..6611b9b 100644
--- a/apps/api/src/errors/AppError.ts
+++ b/apps/api/src/errors/AppError.ts
@@ -19,9 +19,3 @@ export class NotFoundError extends AppError {
     super(message, 404);
   }
 }
-
-export class ConflictError extends AppError {
-  constructor(message: string) {
-    super(message, 409);
-  }
-}
diff --git a/apps/api/src/middleware/authMiddleware.ts b/apps/api/src/middleware/authMiddleware.ts
index 744c5e4..da18d01 100644
--- a/apps/api/src/middleware/authMiddleware.ts
+++ b/apps/api/src/middleware/authMiddleware.ts
@@ -16,7 +16,5 @@ export const requireAuth = async (
     return;
   }
 
-  req.session = session;
-
   next();
 };
diff --git a/apps/api/src/routes/apiRouter.ts b/apps/api/src/routes/apiRouter.ts
index f5ebd01..6ad84eb 100644
--- a/apps/api/src/routes/apiRouter.ts
+++ b/apps/api/src/routes/apiRouter.ts
@@ -2,10 +2,8 @@ import express from "express";
 import { Router } from "express";
 import { healthRouter } from "./healthRouter.js";
 import { gameRouter } from "./gameRouter.js";
-import { lobbyRouter } from "./lobbyRouter.js";
 
 export const apiRouter: Router = express.Router();
 
 apiRouter.use("/health", healthRouter);
 apiRouter.use("/game", gameRouter);
-apiRouter.use("/lobbies", lobbyRouter);
diff --git a/apps/api/src/routes/lobbyRouter.ts b/apps/api/src/routes/lobbyRouter.ts
deleted file mode 100644
index 5bd82dd..0000000
--- a/apps/api/src/routes/lobbyRouter.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import express from "express";
-import type { Router } from "express";
-import {
-  createLobbyHandler,
-  joinLobbyHandler,
-} from "../controllers/lobbyController.js";
-import { requireAuth } from "../middleware/authMiddleware.js";
-
-export const lobbyRouter: Router = express.Router();
-
-lobbyRouter.use(requireAuth);
-
-lobbyRouter.post("/", createLobbyHandler);
-lobbyRouter.post("/:code/join", joinLobbyHandler);
diff --git a/apps/api/src/services/lobbyService.ts b/apps/api/src/services/lobbyService.ts
deleted file mode 100644
index 3e307ef..0000000
--- a/apps/api/src/services/lobbyService.ts
+++ /dev/null
@@ -1,70 +0,0 @@
-import { randomInt } from "crypto";
-import {
-  createLobby as createLobbyModel,
-  getLobbyByCodeWithPlayers,
-  addPlayer,
-} from "@lila/db";
-import type { Lobby, LobbyWithPlayers } from "@lila/db";
-import { MAX_LOBBY_PLAYERS } from "@lila/shared";
-import { NotFoundError, ConflictError, AppError } from "../errors/AppError.js";
-
-const CODE_ALPHABET = "0123456789ABCDEFGHJKMNPQRSTVWXYZ"; // Crockford Base32
-const CODE_LENGTH = 6;
-const MAX_CODE_ATTEMPTS = 5;
-
-const generateLobbyCode = (): string => {
-  let code = "";
-  for (let i = 0; i < CODE_LENGTH; i++) {
-    code += CODE_ALPHABET[randomInt(CODE_ALPHABET.length)];
-  }
-  return code;
-};
-
-const isUniqueViolation = (err: unknown): boolean => {
-  return (err as { code?: string })?.code === "23505";
-};
-
-export const createLobby = async (hostUserId: string): Promise<Lobby> => {
-  for (let i = 0; i < MAX_CODE_ATTEMPTS; i++) {
-    const code = generateLobbyCode();
-    try {
-      return await createLobbyModel(code, hostUserId);
-    } catch (err) {
-      if (isUniqueViolation(err)) continue;
-      throw err;
-    }
-  }
-  throw new AppError("Could not generate a unique lobby code", 500);
-};
-
-export const joinLobby = async (
-  code: string,
-  userId: string,
-): Promise<LobbyWithPlayers> => {
-  const lobby = await getLobbyByCodeWithPlayers(code);
-  if (!lobby) {
-    throw new NotFoundError(`Lobby not found: ${code}`);
-  }
-  if (lobby.status !== "waiting") {
-    throw new ConflictError("Game has already started");
-  }
-  if (lobby.players.some((p) => p.userId === userId)) {
-    return lobby; // idempotent: already in lobby
-  }
-  if (lobby.players.length >= MAX_LOBBY_PLAYERS) {
-    throw new ConflictError("Lobby is full");
-  }
-
-  const player = await addPlayer(lobby.id, userId, MAX_LOBBY_PLAYERS);
-  if (!player) {
-    // Race fallback: another request filled the last slot, started the game,
-    // or the user joined concurrently. Pre-checks above handle the common cases.
-    throw new ConflictError("Lobby is no longer available");
-  }
-
-  const fresh = await getLobbyByCodeWithPlayers(code);
-  if (!fresh) {
-    throw new AppError("Lobby disappeared during join", 500);
-  }
-  return fresh;
-};
diff --git a/apps/api/src/types/express.d.ts b/apps/api/src/types/express.d.ts
deleted file mode 100644
index 914a2fd..0000000
--- a/apps/api/src/types/express.d.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import type { Session, User } from "better-auth";
-
-declare global {
-  namespace Express {
-    interface Request {
-      session?: { session: Session; user: User };
-    }
-  }
-}
-
-export {};
diff --git a/packages/db/src/index.ts b/packages/db/src/index.ts
index baa05e0..02eb21c 100644
--- a/packages/db/src/index.ts
+++ b/packages/db/src/index.ts
@@ -12,4 +12,3 @@ config({
 export const db = drizzle(process.env["DATABASE_URL"]!, { schema });
 
 export * from "./models/termModel.js";
-export * from "./models/lobbyModel.js";
diff --git a/packages/shared/src/constants.ts b/packages/shared/src/constants.ts
index e218a43..fa69eb0 100644
--- a/packages/shared/src/constants.ts
+++ b/packages/shared/src/constants.ts
@@ -16,5 +16,3 @@ export type DifficultyLevel = (typeof DIFFICULTY_LEVELS)[number];
 
 export const LOBBY_STATUSES = ["waiting", "in_progress", "finished"] as const;
 export type LobbyStatus = (typeof LOBBY_STATUSES)[number];
-
-export const MAX_LOBBY_PLAYERS = 4;