Flip-Out is a memory-type of game where you get a stack of bricks shown and you should try to pair them up, til they're all gone.
In this game you will practise remembering the darts maths and you don't need darts or a dartboard. Play the game on the bus, or when you're bored waiting for something. The cards can be as easy as pairing 5*4 with 20, but the cards will be harder for each level.
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