diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 0000000..f759ae8
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,98 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+Business Minesweeper is a real-time multiplayer minesweeper game with expanding boards, user accounts, match history, spectating, and collectibles. Built with React frontend and Bun backend using WebSockets for real-time communication.
+
+## Development Commands
+
+### Setup
+```bash
+# Initial setup (requires Bun installed)
+echo "SECRET=SOME_RANDOM_STRING" > .env
+bun install
+bun run drizzle:migrate
+```
+
+### Development
+```bash
+bun dev                    # Start both frontend and backend in development mode
+bun run dev:client         # Start only frontend (Vite dev server)
+bun run dev:backend        # Start only backend with hot reload
+```
+
+### Build & Quality
+```bash
+bun run build             # Build for production (TypeScript compilation + Vite build)
+bun run lint              # Run ESLint
+bun run preview           # Preview production build
+```
+
+### Database
+```bash
+bun run drizzle:schema    # Generate database migrations
+bun run drizzle:migrate   # Run database migrations
+bun run nukedb            # Delete and recreate database (removes sqlite.db)
+```
+
+## Architecture
+
+### Frontend (`src/`)
+- **Framework**: React 18 + TypeScript with Vite build system
+- **Routing**: Wouter for client-side routing
+- **State Management**: 
+  - Jotai for component state (atoms in `src/atoms.ts`)
+  - TanStack Query for server state and caching
+- **Styling**: Tailwind CSS v4 with custom CSS variables
+- **Animation**: Motion (Framer Motion) for UI animations
+- **Game Rendering**: Pixi.js with PixiViewport for the minesweeper board
+
+### Backend (`backend/`)
+- **Runtime**: Bun with TypeScript
+- **Architecture**: WebSocket-based real-time API with controller pattern
+- **Database**: SQLite with Drizzle ORM
+- **Structure**:
+  - `router.ts` - Main request handler and routing
+  - `controller/` - Business logic controllers (game, user, scoreboard)
+  - `repositories/` - Data access layer
+  - `database/` - DB connection and configuration
+  - `entities/` - Type definitions
+  - `events.ts` - Real-time event system
+
+### Communication
+- **WebSocket Client**: `src/wsClient.ts` handles connection, reconnection, and type-safe API calls
+- **Real-time Updates**: Server publishes events to all connected clients for live game updates
+- **Type Safety**: Shared types between frontend/backend via `Routes` interface
+
+### Key Components
+
+#### Game Logic
+- `src/views/endless/Endless.tsx` - Main game view with Pixi.js board
+- `src/components/LazyBoard.tsx` - Game board rendering component
+- `backend/controller/gameController.ts` - Server-side game logic
+
+#### UI Architecture
+- `src/Shell.tsx` - Main layout with responsive drawer navigation
+- `src/main.tsx` - App entry point with routing setup
+- `src/components/` - Reusable UI components using Radix UI primitives
+
+#### Data Flow
+- WebSocket mutations for game actions (reveal, flag, etc.)
+- TanStack Query for caching user data, game state, leaderboards
+- Jotai atoms for local UI state (current game ID, settings)
+
+## Key Patterns
+
+### WebSocket API Usage
+```typescript
+const mutation = useWSMutation("game.reveal");
+const { data } = useWSQuery("game.getGameState", gameId, !!gameId);
+```
+
+### Database Queries
+Uses Drizzle ORM with repository pattern for data access. Each controller has corresponding repository in `backend/repositories/`.
+
+### Real-time Events
+Server publishes events via `backend/events.ts`, frontend handles via WebSocket message listeners in `wsClient.ts`.
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diff --git a/bun.lockb b/bun.lockb
index ab2a726..2269434 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/package.json b/package.json
index cba12a9..158048c 100644
--- a/package.json
+++ b/package.json
@@ -47,7 +47,6 @@
     "react-confetti-boom": "^1.0.0",
     "react-dom": "^18.3.1",
     "tailwind-merge": "^2.5.3",
-    "use-sound": "^4.0.3",
     "wouter": "^3.3.5",
     "zod": "^3.23.8"
   },
diff --git a/src/components/Board.tsx b/src/components/Board.tsx
index add2d08..8eb0778 100644
--- a/src/components/Board.tsx
+++ b/src/components/Board.tsx
@@ -29,7 +29,7 @@ import Coords from "./Coords";
 import { cn } from "../lib/utils";
 import { Button } from "./Button";
 import { Maximize2, Minimize2, RotateCcw } from "lucide-react";
-import useSound from "use-sound";
+import { useAudio } from "../hooks/useAudio";
 import explosion from "../sound/explosion.mp3";
 import "@pixi/canvas-display";
 import "@pixi/canvas-extract";
@@ -80,7 +80,7 @@ const Board: React.FC<BoardProps> = (props) => {
   const [width, setWidth] = useState(0);
   const [height, setHeight] = useState(0);
   const showLastPos = game.user !== user || isServerGame(game);
-  const [playSound] = useSound(explosion, {
+  const [playSound] = useAudio(explosion, {
     volume: 0.5,
   });
 
diff --git a/src/hooks/useAudio.ts b/src/hooks/useAudio.ts
new file mode 100644
index 0000000..f9b2b6c
--- /dev/null
+++ b/src/hooks/useAudio.ts
@@ -0,0 +1,37 @@
+import { useCallback, useRef } from 'react';
+
+interface AudioOptions {
+  volume?: number;
+  loop?: boolean;
+}
+
+export const useAudio = (src: string, options: AudioOptions = {}) => {
+  const audioRef = useRef<HTMLAudioElement | null>(null);
+
+  const play = useCallback(() => {
+    if (!audioRef.current) {
+      audioRef.current = new Audio(src);
+      audioRef.current.volume = options.volume ?? 1;
+      audioRef.current.loop = options.loop ?? false;
+    }
+    
+    // Reset to beginning and play
+    audioRef.current.currentTime = 0;
+    audioRef.current.play().catch((error) => {
+      console.warn('Audio play failed:', error);
+    });
+  }, [src, options.volume, options.loop]);
+
+  const pause = useCallback(() => {
+    audioRef.current?.pause();
+  }, []);
+
+  const stop = useCallback(() => {
+    if (audioRef.current) {
+      audioRef.current.pause();
+      audioRef.current.currentTime = 0;
+    }
+  }, []);
+
+  return [play, { pause, stop }] as const;
+};
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