Enter your puzzle and click solve, or use the sample puzzle
Click ‘Custom Puzzle’ to enter your own problem. All cells become editable.
Click on empty cells to enter numbers 1-9. Gray cells are locked given values.
Invalid entries are highlighted in red. Fix conflicts before solving the puzzle.
Toggle ‘Show Hints’ to see possible values for empty cells as small numbers.
Validate checks both rule compliance and solvability to ensure puzzle quality.
Green cells have one solution. Use ‘Fill Obvious’ to auto-complete them.