Math mahjong is a combination of math and popular chinese game mahjong. in this game pair would be 2 equal values. i.e. 12 can be paired with 4+8 you can remove only paired free blocks. the block is free when at least two neighboring sides of it are free, i.e. they have no neighbors on at least two adjacent sides. there is also the possibility to re-shuffle the pieces if there are no moves left, and a number of hints you can use. also there is the bomb power-up which can remove any tile pair.
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