WALKIE

Provably Fair Tile-Reveal Game on Monad Testnet

Built for Mission X: Verifiably Fair

Live Demo

Play Now: walkie.monaliens.xyz

Verify Fairness: walkie.monaliens.xyz/verify

The Concept

WALKIE removes the "trust us, it's fair" problem from gaming. Every trap placement, every reward tile, every game outcome is determined by Pyth Entropy VRF - and players can cryptographically verify it.

Navigate your King from start to goal. Each step reveals what's underneath:

• Safe tiles - Keep moving
• Reward tiles - Collect MON (0.1x to 10x multipliers)
• Traps - Game over, lose your bet

The catch? You can't see what's under a tile until you step on it. But here's the twist - you can prove the game didn't cheat you.

How Provable Fairness Works

┌─────────┐     ┌─────────┐     ┌──────────┐     ┌──────────┐
│ PLAYER  │     │ BACKEND │     │ CONTRACT │     │ PYTH VRF │
└────┬────┘     └────┬────┘     └────┬─────┘     └────┬─────┘
     │               │               │                │
     │  Start Game   │               │                │
     │──────────────>│  Salt Hash    │                │
     │               │──────────────>│  Request VRF   │
     │               │               │───────────────>│
     │               │               │                │
     │               │               │<───────────────│
     │               │               │  VRF Callback  │
     │               │               │                │
     │   Play Game   │               │                │
     │──────────────>│  Reveal Salt  │                │
     │               │──────────────>│                │
     │               │               │                │
     │<──────────────│<──────────────│                │
     │  Verify & Pay │               │                │

The Magic:

1. Backend commits a salt hash before VRF is generated (can't change it later)
2. Pyth VRF provides unpredictable randomness (backend can't predict it)
3. Final seed = keccak256(vrfSeed + backendSalt + gameId + VERSION)
4. Neither party can manipulate the outcome alone

Game Mechanics

Grid	Tiles	Traps	Rewards
5×5	25	3	5-8
6×6	36	5	7-10
7×7	49	7	10-14

Reward Multipliers:

Multiplier	Chance
0.1x	35%
0.2x	25%
0.5x	20%
1x	12%
2x	5%
5x	2.5%
10x	0.5%

Bet Range: 0.002 - 0.1 MON

Tech Stack

• Smart Contract: Solidity 0.8.22, UUPS Upgradeable Proxy (OpenZeppelin)
• VRF Provider: Pyth Entropy
• Frontend: Next.js 16, React 19, TypeScript
• Wallet: Reown AppKit + Wagmi v2
• Backend: Express.js, MongoDB, WebSocket
• Network: Monad Testnet (Chain ID: 10143)

Contract

Address: 0xB842b4B9d13bBcf5dDd2a47741e6D1610E34D497

View on Monad Testnet Explorer

Why This Matters

Traditional games ask players to trust that RNG isn't rigged. WALKIE proves it isn't:

• Transparent: Every game's randomness source is on-chain
• Verifiable: Players can independently recalculate trap/reward positions
• Trustless: Smart contract enforces fairness - backend can't lie about tile contents
• Open Source: Verify the code yourself

Local Development

# Install dependencies
npm install
cd frontend-next && npm install
cd ../backend && npm install

# Run frontend
cd frontend-next && npm run dev

# Run backend
cd backend && npm run dev

# Deploy contracts
npx hardhat run scripts/deploy-testnet.js --network monad-testnet

Team

Built by Monaliens

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Powered by Pyth Entropy VRF on Monad Testnet