Riichi puzzles worth thinking through

Explore 12 original Riichi positions and six historical calling exercises from R. F. Foster's 1924 book. The From the books collection preserves the printed tile fragments and answers, with page-level source credits. Historical exercises teach hand structure, not Riichi scoring.

Take your time, request a hint and compare the alternatives after answering. Deterministic answers are checked against our rules engine; strategy exercises do not claim a universally best move.

Start with Foundations if you are learning the basics, or try the daily tile-efficiency puzzle. Challenge progress stays in your browser, separately for each account.