Now approaching its fifth decade of availability, Erno Rubik's venerable Cube is one of the world's best-selling toys: over 350 million have confounded eager puzzle fans.
So it's hardly surprising it's given birth to a whole genre of spin-offs, remixes, and other novelties that in one way or another owe their inspiration to Rubik's original masterpiece. Some are easier, some are harder -- some are much, much harder -- but all of them will get your brain in gear.
Flex your fingers and check out these crazy cubes.
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