How do I scan a Sudoku?
First, make sure you have selected the correct Sudoku variant and grid size from the menu. The scanner uses the grid size to extract the cells, so scanning with the wrong size will fail to recognize the characters.
Press the Scan button to open the camera. Point the camera at a printed Sudoku puzzle and follow the on-screen instructions:
- Find the grid — the scanner is looking for the grid outline. Make sure the full grid is in view.
- Move closer to the grid — the grid was found but is too small. Move your device closer so the grid fills more of the screen.
- Hold steady — the grid is detected and large enough. Keep still for a moment while the scanner captures the image.
Tips for a good scan
- A printed puzzle on paper gives the best results. Scanning from a tablet works well too. Low-resolution monitors often fail due to moiré patterns.
- Lay the paper flat on a surface. Wrinkled, folded or curled paper distorts the grid and confuses the scanner.
- Avoid heavy shadows across the grid. Even lighting gives the best results.
- Make sure the entire grid is visible in the camera view, including the outer border.
After a successful scan, the recognized numbers appear in the grid and the confidence percentage is shown in the status bar. A good scan should be close to 100%. Lower confidence may mean some cells were misread — double-check before solving.