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17 Clues SudokusSudokus.co.nf offers nearly 50,000 different sudokus with only 17 clues. This is the absolute minimum, which makes them quite difficult. A solver, help-function, print function and free e-book are included.
Sudoku123.caSudoku123.ca is home to the 'Sudoku challenge among friends and relatives', a multiplayer Sudoku variant with scores for 2 to 5 people.
digipuzzle.netOn digipuzzle.net you can play free photopuzzles such as jigsaw, 15-game, memory, photo-search, photo-mahjong, sudoku and wordsearch made with the best available photos. For the complete game gallery visit Overview of all puzzles.
Kappa PuzzlesA website by Kappa Puzzle Group, Inc. dedicated to various puzzles and games including Crosswords, Word-Finds, Fill-Ins, Cryptograms, Sudoku and other mind games.
PUZTIMEPuztime is Gakken’s comprehensive online puzzle portal designed for puzzle lovers all over the world. offers a variety of puzzles including unique variations of Number Place, Illust Logic puzzles that reveal whimsical images when completed, Cross Sums with Chinese characters, mazes and much more.
WebsudokuA great Sudoku source By Gideon Greenspan, a self-employed software and web developer living in Tel Aviv, and Rachel Lee. Greenspan has a PhD in Computer Science, specializing in bioinformatics. He was born in the UK and emigrated to Israel in 2000.
Daily-SudokuOffers free daily Sudoku, supplemental information, dedicated forum and a very popular newsletter.
Sudoku (Wikipedia)Everything there is to know about Sudoku on the world's most popular online encyclopedia - Rules and terminology, Solution methods, Difficulty ratings, Construction, Variants, Mathematics of Sudoku, History, Popularity in the media, References and External links.
Puzzle SpaceFind information about language and culture independent puzzles and logic games that are published in puzzle magazines: Domino Logic, Number places, Battleship puzzles and more.
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