Don't be fooled by its diminutive size, the world's smallest 7x7x7 Rubik's Cube puzzle, designed by Matt Bahner, is still a considerable challenge, even for a master cube solver. In fact it might actually be even more of a challenge than the larger versions because you need to be far more precise with your finger placement, lest you make one wrong spin and have to waste time fixing your mistake. [YouTube via Boing Boing]

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