Mines

1–24 mines are placed uniformly at random among 25 cells, hidden until you reveal them or the round ends. Every reveal is decided the instant you click it, with crypto.randomInt already having fixed the layout when the round started — nothing adapts to how you're playing.

Because mines are placed independently of reveal order, the chance that your first r reveals are all safe is exactly C(25−mines, r) / C(25, r) — a hypergeometric survival probability, not an approximation. The multiplier for cashing out at that point is set to 0.99 / P(survive r), so the return is exactly 99% for whichever reveal count you stop at.

RTP is exactly 99.00% at every cash-out point — see `npm run rtp`.