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Ages: 7+ Flex your math muscles with this clever brainteaser. Icosoku is a hands-on challenge with endless game play. It all adds up to fun – you can count on it! The object is to arrange the puzzle so that all of the dots touchings a number add up to that number. To create a new challenge simply swap a few number buttons and you have a new challenge to solve! Inventor: Andrea Mainini

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