Magnet Mash is a simple puzzle game based around the workings of magnets. Players are presented with a board covered in various pieces of magnetized or non-magnetized metal. From there, the player must drop a randomly selected magnet from their inventory to alter the game board by attracting other pieces of opposing magnetism or repelling other pieces of the same magnetism. Neutral pieces become magnetized once connected to another piece, though not to the same degree as a piece that starts with magnetism already attached. The aim of each level is to build long magnet chains for a larger score bonus with as many pieces on the board as possible. There are also other combinations, such as arranging magnets in such a state that they are continuously rotating or bouncing between two other magnets. Puzzles scale up in difficulty as the levels progress, with introduction of bombs, more powerful magnets, and electromagnets which can reverse their polarity.

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