- wiki Description of game
- Sudoku play online (with optional timer)
- daily Killer Sudoku also includes "Greater Than" Sudoku and "Greater Than Killer" Sudoku
- Squiggly Sudoku play online
- 25x25 Sudoku play online
- YahooKing SudokuTetris
- Yahoo.it Sudoku
- 100x100 Sudoku
- Amazon: The Mammoth Book of Sudoku: 400 New Puzzles - The Biggest and Best Collection of Sudoku Ever
