纵横麻将 Matrix Mahjong

One tile can do two jobs in Matrix Mahjong. The official description places pairs, chows and pungs across and down a 3×7 grid, with an intersection tile belonging to both patterns at once. The hand is an arrangement whose lines can share a piece.

The winning condition changes with it. Instead of requiring four melds and a pair, the developer says every tile must participate in a valid meld. That makes coverage of every tile you hold the stated requirement. Completing a useful horizontal pattern does not answer whether every tile elsewhere belongs to something valid; a vertical pattern can provide another membership for an intersection.

Scoring possibilities also change. The description names All Honors and Six Identical Chows as patterns to pursue, but provides no worked hand, so their exact construction should not be guessed from conventional Mahjong. The useful first task is understanding how this variant defines validity before transferring a familiar hand-building habit into it.

Available turns are tied to HP. That adds a reason to consider a small win rather than indefinitely waiting for a spectacular score, although the exact conversion is unspecified. The developer also says the game does not center on freely editing a deck to force a build. The attraction is the decision inside the hand received: what can this tile complete across, what can it complete down, and can that overlap help finish the rest before your turns run out?