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Place a bet, then reveal tiles one at a time. Every safe tile holds a chest and raises your multiplier; hitting a mine ends the round and loses the bet. Cash out anytime after your first chest to lock in the current multiplier.
Pick a board of 25, 36, 49 or 64 tiles and set how many mines hide in it with the slider — the green side of the slider shows how many chests remain. More mines (or a smaller board) = faster-growing multipliers but higher risk. Once a bet is placed you're locked in — if you leave or refresh the page, your round is right where you left it when you come back.
The multiplier after k safe picks on a T-tile board with m mines is C(T,k) / C(T−m,k) × 0.97 — the fair inverse survival odds with a 97% RTP (3% house edge). Bets are typed OSRS-style — 10m, 250m, 1b. Min bet 1M, max bet 1B, max win 30B. Revealing every safe tile auto-cashes you out.
Mine positions are derived from HMAC-SHA256(serverSeed, clientSeed:nonce) — fixed the moment you bet, before any tile is revealed. The server seed's SHA-256 hash is shown up front; rotate your seed anytime to reveal the old seed and verify past rounds. Click Check Game Seed in the top bar.
Space — bet / cash out · R — pick a random tile.
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