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Jade
One press cuts a stone, your level names the gems
House Edge: 4%
Jade is an instant gem slot with a memory: every player carries a persistent level from 1 to 5, stored on-chain. One press cuts one stone, and the chain draws a gem from your level's drop table — the common Stone loses the stake, the rare gems pay up to 5000× at the top level.
Levels and the lapse rule
Drawing Tourmaline, the 10× gate gem, climbs you one level; each level up opens a richer table — 10× tops level 1, 5000× tops level 5. Levels lapse when idle: 24 hours without a cut drops levels 1–4 back to level 1, and level 5 holds for a week. The lapse runs on the blockchain's clock and is applied by the program at your next bet; the board shows the last level the chain reported.
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Fairness
The draw is not made by your browser. The chain produces verifiable randomness (Chainlink VRF on Arbitrum, Switchboard on Solana — committed before your bet and verified at reveal), and the gem is drawn from it with one modulo over a million walked down your level's drop table. Take the published value, run the same division, and you get the same gem. All five tables are generated from a single source, live in the program, and return exactly 96% — a 4% house edge, the same rate the original charges.
Randomness by: Chainlink VRF · SwitchboardContract operated by: DODEN.IO