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Smack Mahjong, a variation on the popular tile matching puzzle game. It costs $19.95, and a demo version is available for download.
Features include more than 50 different layouts, and the game includes an editor so you can create your own designs, too. Smack Mahjong sports different tile designs, including a tile set especially crafted for young players, to help them with their alphabet.
Available as a Universal binary, Smack Mahjong requires 256MB RAM and OpenGL graphics.