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Hollow Cube

Hollow Cube

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Regular price
$19.99
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$19.99
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Project Genius uses a 5-star rating system for difficulty with 5 being the most difficult. The Hollow Cube has a rating of 3.5 stars making it one of the most difficult puzzles. The goal of this puzzle is to make each side has 9 unique colors.

Great for any fan of brain teasers! 

Recommended Age: 9+