The forest floor
Take one. It is permanent, and it keeps between climbs.
The game is tuning itself. Every run reports how long it lasted, how high it got and whether the player came straight back; those land on the rungs that were in play, and a cohort of runs closes an epoch and re-picks the numbers. When the shared table is reachable, every player is on the same configuration and the comparison is between epochs rather than between runs. ×n is how much evidence a rung has.