Amidakuji · Randomly decide who gets what
A ladder game (Amidakuji) is mathematically guaranteed to be fair. Vertical lines never cross, and rungs never overlap within a row, so no matter how complex it looks, every number maps to exactly one result, a true one-to-one match.
Rung placement is fully random each time, so the outcome can't be predicted or rigged in advance. Use it to fairly decide who pays, who's on cleanup duty, or the order of presentations, with no arguing needed.