Sudoku of the Day
Have you taken a look at our new book shop, which includes a range of books about sudoku as well as other logic puzzles.
We have also just reduced the prices of our Easy and Medium level E-Books.
Using the "Check" button as a means of storing the current state, so that you can make changes to the puzzle confident that you can use the back button to take you back to the saved state, is a perfectly legitimate way of solving the puzzles and can be compared to using a pencil and a rubber on paper. However, using the "Check" button to see if you've guessed an answer correctly, is not. For this reason, if you guess incorrectly, your time for that puzzle will not be recorded.
If you're being annoyed when adding notes to your puzzle by your browser suggesting values for you, take a look under Tools/Options. Go to the tab Privacy/Saved Forms and disable "Save information I enter in forms and the Search Bar". We are still looking for a method to disable this just when you're on the Sudoku site but until then maybe this fix will help you.
Sudoku Solver - Solving the hardest puzzles
Our solver uses human logic to solve the daily puzzles, so our single step help function shows the next easiest square to fill!
Now the BBC is getting in on the act, with a show that's a mixture of Sudoku and a general knowledge quiz. It's called SUDO-Q.
Origins of Sudoku
Now you've played sudoku of the day online, aren't you intrigued as to how this highly addictive puzzle came about. Like many people, I assumed that sudoku was Japanese, only to discover it was printed in a US magazine well before it reached Japan. More recently I read an article in a German newspaper that said that sudoku was invented by a Swiss mathematician, "Leonhard Euler" and is actually a subset of "Latin Squares". Enough was enough, now I really had to hunt for a more complete description of sudoku history and I believe I've found it in The History of Sudoku.