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The ENI puzzle is designed to enhance mental and physical dexterity: It's a workout for your mind and your fine motor skills! The ENI's cylindrical core is almost entirely covered — there is, crucially, one empty space — in colorful tiles. Rings of tiles can rotate independently, and rows of tiles can slide (as permitted by the location of the empty space). The object of the ENI puzzle is to combine strategic rotations and slides to create patterns. There is no limit to the puzzles you can create! Puzzle booklet included. Available for online purchase from Additions, the shop at MoMath.