Play American Mahjong Online — Free, No Account Needed
Discard Lab is a free browser-based American Mahjong game.
Learn to play and practice the official 2026 NMJL hands
against three AI partners (Bob, Alana, and Jessica) at Beginner,
Intermediate, or Expert difficulty.
- Free — no signup, no download, no account needed
- Plays in any modern browser, on desktop or mobile
- Built-in Charleston, Pung/Kong claims, jokers, and full NMJL win detection
- Lab mode for trying invented hand patterns with the reference card visible
This game requires JavaScript. Please enable JavaScript in your browser
to start playing.