数独解法ツール
Sudoku solver
Some time ago I wrote a simple Javascript program to solve sudoku puzzles. It worked fairly well on simple problems, but often got stumped by the harder ones.
Not any more. This sudoku solver is now based on software written by Tim Eyre of nihilist.org.uk. It's much better at solving these things, and because it's written in C it also runs a lot faster.
To use this tool, fill in the table with the numbers from a sudoku puzzle, leaving the other spaces blank. Then click the Solve button. If you like, you can give it a test drive with this sample puzzle.