In the Madison airport bookstore/gift shop, I saw a three-dimensional Sudoku puzzle. It was a Rubik's cube, with six each of nine numbers instead of nine each of six colors.
Hmmm. Make it a 4x4x4 cube with sixteen letters where the rule is that you can't repeat a letter on a face or on a slice, and I'll endorse it as a Rubik/Sudoku hybrid.
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