Provably fair
Every floor is decided when you place the bet, from a secret server seed whose SHA-256 is shown before the
first drop. The seed is revealed when the tower ends: floor n uses HMAC-SHA256(seed, "floor:n")
(first 13 hex digits ÷ 16¹³) — below the collapse chance is x0, otherwise it picks a multiplier by the weights above.
Finish a tower to verify it here.