Zillions of Games 2 

The demo has 48 free games/puzzles including Reversi, Checkers, Chinese Chess, Blobs, Jungle, Losing Chess, Mini-Go, Dodgem, etc. The full version contains over 350, plus the ability to script your own game rules and download new games from the web.
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JoTower 

Besides being an entertaining game, JoTower effectively trains your ability to concentrate. Your task: The tower that is on the left base at the beginning of the game has to be built up again on the right base.
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