mike | Shared With: Everyone - May 22 2008 | sudoku, math, group theory, puzzlesThere are only 5 billion essentially distinct Sudoku puzzles (solutions) (proof here using Group Theory and Burnside's Lemma).
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Research paper explaining the computation of the number of unique Sudoku grids (accounting for the equivalence relations from renumbering, permutations, and transposition).
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Wikipedia entry on Sudoko has summary of solving techniues and counting of unique Sudoku.
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Catalog of all known Sudoku with a minimun number (17) of hints.
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