Agari: Riichi Mahjong

Agari is a one-time purchase riichi mahjong game made by Ryan Sullenberger and released on Steam in June 2026. It implements the standard riichi ruleset, including all yaku, yakuman, han and fu scoring, and its scoring engine is published as an open source library.

The daily mode is called Daily Wall. Each day the game builds the wall from a deterministic seed taken from the date, so everyone who plays that day draws from the same tiles. You get one round, and the result goes into your Daily Wall history, which syncs between computers through Steam Cloud. It resets at midnight, and the store page compares it to Wordle.

Outside the daily, you can play full games offline against AI opponents with four play styles (offensive, balanced, defensive and closed hand), or open a private online table with a room code for two to four people. A tenpai helper shows your waits, and every match can be replayed on the 3D table with all hands face up.

It suits riichi players who want one serious hand a day without accounts or gacha, and learners who want a built-in reference and a helper while they practise.