Type a puzzle in by hand
You do not need a photo. Type the clues straight onto the board, which is often quicker for a puzzle on a screen or with few clues.
If the board is not empty, tap Clear board (the bin icon at the top right).
Tap a cell, then tap its digit on the number pad. If you tap a digit without choosing a cell first, the app reminds you: Tap a cell first.
Repeat for every clue in the puzzle. The selected cell is highlighted, and so are its row and column, which helps you keep your place.
Check that no digit is red. Red means it clashes with another digit in the same row, column or 3×3 box.
Tap Solve.
To empty a cell, select it and tap the backspace key on the number pad.
Messages you may see
| Message | What to do |
|---|---|
| Enter at least a few clues first (found …). | Sudoku Solver needs at least 8 clues before it tries. Add the rest of the puzzle's clues. |
| The grid has conflicts (shown in red) — fix them first. | Two digits clash. Correct the red ones. |
| This puzzle has no solution — a digit is probably misread. | The clues are consistent but cannot be completed. Check each clue against the puzzle. |
Change your mind after solving
Tap any cell and enter a digit. Sudoku Solver keeps the clues, removes the answers it filled in, and you can tap Solve again.