Tower

1. 01

   For each row, shuffle its tile indices with Fisher–Yates using that row's floats; the first `safe` indices are the safe tiles.

2. 02

   All nine rows are fixed when the round starts and shown after it ends.

float(k) and the rest of the notation are defined in the byte stream.

Climb nine rows. On each row pick one tile; safe tiles take you up, a trap ends the round.

Difficulty sets tiles per row and how many are safe: easy 3 of 4, medium 2 of 3, hard 1 of 2, expert 1 of 3, master 1 of 4.

After n rows the multiplier is 0.98 × (tiles / safe)ⁿ. Cash out after any row.