Unofficial · fan-made

Jane Street Puzzle Practice

Smaller, playable versions of Jane Street's monthly puzzles. Warm up on little boards until the rules click, then take on the real one.

  1. October 2026

    It's a Metric, Too

    Split the grid into symmetric states, find their capitols and match the travel-cost clues. 48 practice boards from 4×4 to 7×7, plus the original 11×11.

    Capitol magnets →