CISRA Puzzle Competition 2013 - Hints

3E. Sudorubikube

• Ignoring what was given, consider what the Sudoku must look like when flattened - all numbers upright. How and where can a Rubik twist move a piece? The 6s, 8s, and 9s are deliberately rotationally ambiguous.
• Start with the corner cubelets, they're the easiest to place, then examine the edges. The constraints of a Rubik's cube are such that the edge pieces cannot be exchanged with their neighbours.
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