The Game It'll consume all of your free time – seriously

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The best sudoku game EVER will be ready in just a moment...

Disclaimer This game is optimized for standards compliant browsers like Mozilla Firefox. If you're using Internet Explorer, the experience will be passable but nowhere near as sweet as if you used a browser that isn't stuck in the stone age.
Important Your browser has a few restrictions on keyboard shortcuts that this game can use. If you're used to playing on Firefox or IE6, some keyboard shortcuts might be different. Take a look at the "Shortcuts" tab to see which ones are different – the ones that aren't the same will be highlighted in red.
Help Out Do you have any comments or suggestions? Is there some feature you'd love to have? Is there some feature you can't stand? What feature can you not live without? If you've got an opinion, we'd love to hear it. Contact Us.

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Features of Online Sudoku More advanced features than you can shake a stick at

Online Sudoku is easier to use yet more powerful than 95% of computer-based sudoku games out there. It's surprisingly full-featured. The following is a list of just a handful of the cool features it sports:

Beautiful, Easy-to-Use Interface We promise, you've never seen an interface this simple and easy-to-use for a computer-based sudoku game—much less an online game.
Keyboard Shortcuts Never before has playing sudoku on a computer been so easy! Dozens of powerful keyboard shortcuts make it almost as intuitive as playing with pen and paper—an in a web-browser, no less.
Powerful Marks System A problem with most computer sudoku games is that their marks are too darned hard to use easily. Online Sudoku makes it easier than you ever thought possible.
Hundreds of Puzzles With hundreds of puzzles to play in four difficulty levels, you'll never run out.
Input Custom Puzzles Want to play a real-world puzzle in the application? No problem—with the built in custom mode, it couldn't be easier to enter a puzzle you've seen elsewhere and be playing it within seconds!
Save Your Progress Automatically save your progress across multiple sessions. A sophisticated auto-save ensures that you'll never lose your progress again.
Play on a Plane or in a Car Because this game is web-based, you'd think you wouldn't be able to take it with you on a long trip. Wrong. Online Sudoku features a powerful offline mode that can queue up to 20 puzzles for playing when you're in the air or on the road.
Play it Anywhere Because Online Sudoku is web-based, you can fire it up on any computer that has access to the internet.
Share Puzzles With Friends You can easily generate links for your friends to your puzzle with all of your current progress, or to the a blank version of the puzzle you're working on. See who can solve the puzzle the fastest!
Hall of Fame Registered users have the chance of showing up on the top scores list, letting everyone else know just how awesome they are at sudoku.
Multiple Display Sizes Pick from three different display sizes to make the grid the size that's right for you.
Undo/Redo Multiple Levels Hit the 'u' key to undo, the 'r' key to redo. Online Sudoku lets you undo/redo to your heart's content.
Sophisticated Hint Feature Never again will you get stuck on a hard puzzle. Online Sudoku's sophisticated hint feature can help out with almost any puzzle and—what's better—it'll let you know the logic behind the hint it's giving you.
Automatic Time Penalties In order to make the Hall of Fame times fair, if you use a time-saving feature your solve-time will be adjusted accordingly.
It's FREE Most computer-based sudoku games worth their salt want you to pony up money to download and play. Online Sudoku is 100% free—and has more features than a lot of the other computer-based sudoku games combined!