An exercise in implementing Sudoku solver with bit arithmetic.
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Sudoku Solver Using Bit Arithmetic

UPDATE: Unfortunately this doesn't solve all sudokus yet. For example 300200000000107000706030500070009080900020004010800050009040301000702000000008006 proves to be too difficult for now. This will be fixed ASAP.

After 4 years of (mostly inactive) development, the solver can finally solve sudokus from each of's difficulty levels. Coming up next: lots of refactoring!