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document updated 15 years ago, on Feb 26, 2010

Sudoku puzzles can be printed out, and worked on the train:

online puzzle generators
- opensky.ca/~jdhildeb — nice! I really like this one!
- CountToNine.com
- SudoPDF
locally-installed applications that can generate and print puzzles
- Sudokumat
- sudoku-pdf @ code.google.com
- Sudoku Printer (shareware)
- a prototype Perl version
daily pre-made puzzles
- sudokupuzzles.com
pre-made puzzles