Tool · Solver
Sudoku Solver
Enter your puzzle below and tap Solve. Leave unknown cells blank. Paste an 81-character string (digits, with 0 or . for blanks) into any cell to load a puzzle instantly.
How to use
- Type digits 1–9 into the grid. Arrow keys navigate; Backspace clears.
- Paste an 81-character puzzle string into any cell to auto-load it.
- Tap Solve — your original entries stay highlighted in the accent color.
Frequently asked questions
How does the Sudoku solver work?
Enter the given digits of any 9×9 Sudoku puzzle and SodokuDX will solve it step by step, showing the technique used at each step — from hidden singles to X-Wings and chains.
Can the solver handle any Sudoku?
Yes — any well-formed 9×9 puzzle with a unique solution. The solver uses the same logic engine that grades our own puzzles.
Is the Sudoku solver free?
Yes. The solver is free and unlimited. Pro members also get step-by-step technique explanations.