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Miscellaneous Sudoku
- Wikipedia
Article on sudoku history, terminology, solution methods, mathematics. - Yahoo! Sudoku Directory
A short list of sudoku links. - Sudoku Solutions
Publishes solutions to newspaper puzzles. No explanation or logical steps given, just the solution digits. - How many sudoku puzzles?
Article about calculating the number of unique sudoku puzzles. Concludes that there are 6670903752021072936960 sudoku grids.