Web Sudoku Billions of free Sudoku Puzzles to play online Four skill levels to choose from: Easy, Medium, Hard, and Evil. Huge database of puzzles available for online play, and you can print puzzles for personal use. Options available to you include a competitive puzzle timer, personal statistics, and "How am I doing?" help button.
Sudoku.org.uk Daily Sudoku Puzzle, Daily Jigsaw Sudoku, and Daily Killer Sudoku Puzzle Different difficulty levels include gentle, moderate, tough, and diabolical. You can print these out and do them on paper, enter your answers in competitions, join the discussion forum, and check out the previous puzzle solution archive. There is also a Sudoku Assistant - a step by step Sudoku Helper if you need it. Try the fun Jigsaw Sudoku - exactly the same as a normal Sudoku - fill in the rows and columns and boxes with 1 to 9 without the same number appearing in any row, column or box - BUT, in a Jigsaw, the boxes are rather strange shapes.