Two complete networks run inside this page: a Bitcoin-like chain with real keys, a mempool and proof-of-work mining, and an Ethereum-like chain with a real EVM, gas and proof-of-stake finality. Every action you take is drawn step by step. Complete 16 quests in order, earn badges verified by our server, climb the leaderboard. No signup, no downloads, no real money.
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01 · ReadEach quest opens with a short explanation of one idea: keys, fees, gas, finality.
02 · Do itPerform the real action in the sandbox: sign, send, mine, deploy, revert.
03 · WatchThe diagram replays what just happened across wallet, network, mempool, block and chain.
04 · EarnThe site checks the result, the badge server verifies your cryptographic proof, and the next quest unlocks.
Everything here is a simulation: sBTC and sETH have no value, mining difficulty is a few thousand hashes, blocks are tiny, coinbase outputs mature in 3 blocks and epochs are 4 slots. The cryptography (secp256k1, SHA-256, RIPEMD-160, keccak-256, bech32) and the EVM semantics are real. Your key and progress are stored in this browser; when you complete a quest, your address, a display name if you set one, and a cryptographic proof are sent to our badge server, which records the badge and the leaderboard (see the Privacy Policy).