First, a quick signpost, because two very different games share this name. If you arrived hoping to clear a stacked board by clicking matching tile pairs, that puzzle is Mahjong Solitaire — our free version lives at www.playmahjongsolitaire.org, and our Mahjong vs Mahjong Solitaire guide lays out every difference between the two. What you will find on this page is the original table game: four players, a shared wall, and a race to the first complete hand.
Table Mahjong runs on a simple loop with deep consequences. On your turn you draw one tile, weigh what it does for your hand, and throw one tile face up where the whole table can see it. Between your turns the three AI opponents do the same — and any tile they throw might be exactly the one you need, which is where claims come in.
Claims are what separate Mahjong from every draw-and-discard card game you have played. When an opponent releases a tile you can use, buttons appear at the bottom of the table: pong takes it to complete a triplet, kong takes it for four of a kind and earns a replacement draw from the wall, chow builds a run — though only off the player to your left — and win takes it to finish your hand on the spot. Every claim exposes part of your hand, so each one is a real decision, not a reflex.
The wall behind all of this holds 136 tiles: 108 suited tiles across bamboo, characters, and dots (numbers one through nine, four copies of each), 16 wind tiles, and 12 dragon tiles. You hold 13 tiles between turns, and as East you open the game by throwing your first discard from a 14th. Flower tiles, seasons, and regional scoring tables are deliberately left out so the core game stays readable while you learn it.
Three difficulty settings let you scale the opposition from forgiving to sharp, and the writing on this site grows with you. The rules page walks through setup, turn order, and every claim in sequence; the strategy guide covers which tiles to release early and when a claim costs more than it gains; and the American Mahjong guide explains the NMJL game with its racks, jokers, Charleston, and annual card of hands.