Somewhere in the world a physical cache contains a secret string. Its SHA-256 hash is published on-chain. Unlock clues with ETH to narrow the search area, then go find it. If your submitted string matches the hash, you win the pot.

One round at a time, governed entirely by smart contract. No human judgment, no appeals. Every clue unlock and every guess costs ETH, 90% of which feeds the prize pool. A fixed 5% of every winning pot goes to charity.

Connect a wallet, study the clues, watch the arena, and submit a guess when you are ready. Full rules are in the constitution.