My wife and daughter play this game. It uses simple math and I think it is very good for children to practice their math. They have 2 x 2, 3 x 3 like below and 4 x 4 . You must put the numbers into the blank squares so that they equals numbers on the right and bottom. There are levels for math wizards but very difficult. It is very easy to using. It is at apple itunes. It is free.
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