At Web Sudoku you'll find easy, medium, hard and evil Sudoku that you can play online. The interface is cleanly done and you can generate as many free Sudoku puzzles as you like, but you need to buy the Deluxe version for the solutions. With the deluxe version, for a one-time fee of $14.95 you get the convenience of being able to play your games offline, as well as larger grids, extra-tough sudoku, several variations of the game and more. Register and compare times with others in your age group. Or print your own customized Sudoku ebook with 8 pages of either easy, advanced, kid or combination puzzles.
Jigsaw Sudoku, as its name would imply, is a cross between the jigsaw puzzle and the Sudoku puzzle. Instead of typing in a number, you grab and drag the number squares to their proper places. The colorful interface makes the game fun for younger solvers, who can start with the 4x4 grids, then move on to 6x6 and 9x9 when they're ready for more challenging games. Use the options button to set the size of the grid, the difficulty, and whether to use numbers, letters or symbols.
The Daily Sudoku offers four new puzzles every day: Classic, Monster, Kids and Squiggly (the grid isn't divided into 9 squares, but into irregular blocks). Play these free Sudoku games online or print and solve (requires Adobe Acrobat Reader).
Another source for free daily sudoku puzzles is the Sudoku Page at The New York Times . These puzzles come in Easy, Medium and Difficult versions, so you can select the one which best suits your level of expertise.
If you're looking for the ultimate sudoku challenge, try Samurai Sudoku. These challenging puzzles consist of five overlapping sudoku grids. There's a new puzzle every day and you can also access the archive of past puzzles. Offering the puzzles in seven different languages is a nice touch.
Speed solvers who'd like to compete against other players, might enjoy the Daily Sudoku Competition to see who can solve these tough sudoku puzzles the fastest.
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