I've just made a few updates:

- You can now choose whether Undo undoes both numbers and cage combinations toggles (in the Combinations box) or just numbers. The option is in Preferences.

- When a number is toggled in a multi-cell selection, it's now added to each cell as a note/pencil mark instead of a final answer.


- If some cells in a multi-cell selection contain the number being toggled while others don't, the two groups used to be "swapped", in that the number would be removed from the cells that contained it, and added to the cells that didn't. I've changed it so that the number is now only added - effectively bringing the cells into sync. Once they're in sync, they can be toggled "all off" or "all on" together.

- Fixed a few bugs.

As ever, please let me know if you find any problems or have any suggestions!


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Thanks to everyone that's written to me about the new site. I've had literally hundreds of messages and a lot of kind words!

I've also had loads of suggestions for enhancements and new features. I'll try to get through as many of them as I can.

By far the most popular were the Combinations Reset and Hide buttons, so I've added those today, as well as swapping the order of the Combinations and Calculator back to how they were on the old site, which was also a common request.


If you have any ideas or suggestions, or anything isn't working as it should, please let me know. I'm always happy to hear from you!

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Today I released the new-look, with a host of new features. It works on desktops, laptops, tablets and phones. I hope you like it!

Daily Killer Sudoku updated their profile picture.
January 23
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Daily Killer Sudoku updated their cover photo.
January 23
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Greater-Than Killer Sudoku is here. Let me know what you think!

Coming soon... Greater Than Killer Sudoku!

Welcome to the facebook page! If you have any suggestions for the site, please write them on this wall and I'll try to get them done (although my wife and I are expecting our first baby in January, so it may take a little longer than usual!). In the meantime, I hope you enjoy the puzzles!

Free Killer Sudoku every day! Realistic, interactive online play. Printable puzzles. Hundreds of past puzzles to choose from.