Sudoku Solver
Solve any sudoku puzzle instantly.
Type a digit 1 to 9 in each cell. Provided cells show in blue. Solved cells show in gray.
About
Type in your puzzle (or paste from a string). The solver finds the answer using backtracking with constraint propagation. Also flags invalid puzzles.
How to use
- Click cells to enter known numbers.
- Click Solve.
- See the completed grid.
FAQ
Does it find unique solutions?+
It finds one valid solution. If the puzzle has multiple solutions, you get one of them. Real sudokus should have exactly one.
How fast is it?+
Hardest known sudokus solve in under 100ms with this approach.