Sudoku Solver
Type your puzzle into the grid and solve it instantly using a backtracking algorithm — or check your own progress for conflicts. Nothing you enter ever leaves your browser.
How to Use
1. Click a cell and type a digit from 1-9. Leave a cell blank if it's unknown.
2. Click Solve to instantly fill in every remaining cell.
3. Click Check for Conflicts at any time to highlight cells that break Sudoku's rules, without solving.
4. Click Load Example to try a sample puzzle, or Clear to start over.
Frequently Asked Questions
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