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From Clinton H Weir:
Everyone's favorite number arrangement logic game is back, with a colorful new twist. Arrange color tiles in a 9x9 grid so that every row, column and square of 9 cells contains exactly one of each tile. And now you can play the game in this simple and easy version for iPhone, iPad and iPod Touch.To place a tile into the puzzle: First touch the tile you wish to place into the puzzle, then touch the cell you want to place it in. If the tile can not be placed in that cell (because the tile already appears in that row, column or square) it will not be accepted.