100 different Sudoku puzzles in five degrees of difficulty from very easy to very hard. The rules for solving a Sudoku are simple: Each row, column and region must contain the numerals from 1 through 9 exactly once. The Puzzles are in Adobe PDF file format and have not to be installed. You can easily print and then work them out with pencil and paper.
See also: Su-Do-Ku Puzzles, puzzle, sudoku, puzzles, su doku, numberplace, number place