Sudoku Spoiler

June 11, 2005.

This is a program for solving the little Japanese number crosswords that have been popping up all over newspapers and the web lately. They are known as Sudoku and can be quite frustrating to solve manually, although the rules are simple.
The program will solve any given configuration of initial clue numbers, provided a solution exists. And it will also tell you (in case you wanted to know) exactly how long it needed to "think." It's pretty fast. Try it!

Use the cursor keys or the mouse to position the red highlight on the square you want to modify. Press 1-9 to fill the square with that digit or 0 (or SPACE) to erase. The "Clear" button erases the entire board (click on it twice if you wish to remove both a computed solution and the clue numbers).