Mathematical Recreations - Custom Word Doku puzzles devised by Steve Schaefer. Features an entire sentence embedded into the puzzle. Sudokuto - Two-player variant. Offers several board sizes to play against the computer. This site has many other Sudoku variations (e.g., Wordoku, 3D Sudoku, Calcudoku, Greater Than Sudoku, etc.) [English/Norsk] Sidokus - Sidokus are musical sudokus, with musical notes instead of numbers and a hidden melody. Samurai Sudoku - Offers one puzzle each day, with a step-by-step solver. Dr. Gareth Moore's Puzzlemix - Site with many Sudoku variants, all playable online. Parole Crociate - Site with user-submitted puzzles, including Sudoku variants, crosswords, rebus, etc. Puzzles can be solved online for points. [English/Italiano] SudokuWiki - Site with Sudoku and many variants, as well solvers, strategy explanations, etc. Giant Sudokus - Sudokus in many sizes from 6x6 to 100x100. Real Sudoku3D - 3D Sudoku program for Windows and Mac. Easy puzzles are free, others cost money. 10 Hardest Logic/Number Puzzles - A list of the hardest known puzzles for Sudoku and several Sudoku variants. Sudoku123.ca - A set of rules applicable to a regular Sudoku, that allows 2 to 5 players solve a single puzzle, and compete for points. [English/Français] Sudoku variants - Site with many Sudoku variants not seen elsewhere. Picture Sudoku - Sudoku variant using sets of puzzles, with matching coloured regions in each puzzle having the same solution. Sudo10 Sudoku variant - The usual rules of sudoku apply, but the board is an 8x8 board split into 8 triangular cells. pi-c-it Sudoku - Generates and solves classic and X-Sudoku problems. Diverse options and an integrated help facility. Fun With Puzzles - Contain lots of Sudoku as well as logical and fun puzzles. Also offers many online games. LatinPuzzles.com - Generalizes Sudoku with varied boards, repeated symbols and full words inside the boards.