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The world's best-selling toy.
Here are a few facts:
Originally advertised as having over 3 billion permutations, apparently there are actually over 43 quintillion, that's 43 followed by fifteen zeroes.
The centre squares on each side don't move and under the surface are joined together as one piece forming the skeleton of the cube about which all the other cubes rotate.
Google worked out that it should be possible to solve it in 20 moves.
Most people solve it layer by layer but it is actually better to solve a 2x2x2 block, enlarge it to a 2x2x3 block and then sort out the incorrect edges.
The world record solving time is 3.47 seconds.ÃÂÃÂÃÂÃÂ A robot achieved it in 0.38 seconds. The world record using feet only is 15.56 seconds.ÃÂÃÂÃÂÃÂ ÃÂÃÂÃÂÃÂ
I can't do it.