HATO is a 4 dimensional cube.  It consists of a 2x2x2 cube plus 6 smaller embedded 2x2x2 cubes therein. Embed is a term in mathematics, we think it is also a suitable description of this structure.  Compared with software simulated 4d cubes(2^4 cube), the total number of positions of HATO is significantly larger. 
This added dimension makes this cube much harder than it looks!
Size: Approx. 7.5 cm x 7.5 cm x 7.5 cm
Made by: Very Puzzles

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