Web Directory

» Eijidoku
   Word based version of the game.
   http://www.eijidoku.com/

» Killer Samurai Sudoku
   Offers printable samurai sudoku puzzles for download. Also provides rules and solution strategies.
   http://www.killer-samurai.com/

» Math Games: Sudoku Variations
   Offers detailed descriptions and illustrations of Sudoku variations, including Diagonal, Cubical, Even-Odd, and hybrids. Also includes a short history.
   http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html

» Mathematical Recreations
   Custom Word Doku puzzles devised by Steve Schaefer. Features an entire sentence embedded into the puzzle.
   http://www.mathrec.org/sudoku/

» Sudoku Samurai
   Offers printable sudoku samurai puzzles for download.
   http://www.binaryworlds.com/sudoku/

» Sudoku-Ball
   A three dimensional version of the puzzle. Includes game rules, online version and news.
   http://www.sudoku-ball.com/

» Sudokuto
   Two-player variant. Offers several board sizes to play against the computer. [English/Norsk]
   http://www.menneske.no/sudokuto/eng/