Ninety-nine number tiles (eleven each of numbers zero through eight) are placed in Scrabble fashion onto a 13X13 grid. Each player plays from and replenishes a rack of six tiles, placing some or all of those tiles in a straight line so that they intersect or extend an existing line of tiles in the grid. The tiles in each line affected by the play must add up to zero or to a multiple of nine. The player scores a point for each multiple of nine and for each occurrence of zero in the affected lines. Placing on premium squares enhances scoring. The game ends when no tiles are left to draw, and one player has emptied his rack.

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