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It's in one of his books, (I dont think he invented it), entitled Mathematical Puzzles and Diversions, or something like that. It's an added dimension of potential cubes.
(hide) In the mood for a quick game that is guaranteed to finish within 2 hours? Create a new game of your preference, select the Time for game and set Time to 0 days / 1 hour, Bonus to 0 days / 0 hours and Limit to 0 days / 1 hours. (TeamBundy) (show all tips)