In the main game, players draw eight tiles to start the game. On a
turn, a player adds a single row or column of tiles to the playing area
to create valid plays – that is, the sum of the tiles played and all
rows or columns added to during that turn sum to a multiple of the key
number. The player scores the sum of the tiles played, and the sum of
tiles in any row or column added to during that turn. If you finished a
row or column of six tiles – that is, one with all six colors – you take
another turn immediately before refilling your hand to eight tiles. The
game ends when no one can play, and numbers in hand count against a
player's score. High score wins.
Other games include "Speed Sumoku" in which players each have ten
tiles and try to create a crossword-style grid in which all sets of
tiles sum to a multiple of the key number before anyone else. "Team
Sumoku" plays similarly, but with each team creating one grid. "Spot
Sumoku" has players trying to spot four tiles that sum to a multiple of
the key number rolled from a public array of ten tiles. "Solo Sumoku"
tasks a player with drawing 16 tiles and creating a legal grid from
them, then drawing ten more tiles and adding them to the existing grid
in a legal manner, then doing this with another ten tiles, and so on
through all 96 tiles.
