Sudoku Generator: A Fresh Puzzle With Exactly One Solution
A good Sudoku has one answer and no guessing. This generator earns that by testing every removal, so each puzzle it hands you is properly solvable.
What is the Sudoku Generator?
This generator builds a complete Sudoku grid, then removes numbers one at a time, keeping a removal only when the puzzle still has exactly one solution. That check is what makes the puzzle properly solvable rather than guesswork. Choose easy, medium, or hard, and use 0 or a dot for each empty cell.
How to use it
- Choose easy, medium, or hard.
- Click Generate Puzzle.
- Fill each row, column, and 3 by 3 box with digits 1 to 9.
- Use dots for empty cells and check your answer against the solution button.
Worked example
An easy puzzle removes 32 numbers from a full grid while keeping exactly one solution.
How do you know a Sudoku has only one solution?
By solving it while counting: if a second complete grid ever appears, the count stops at two. This generator keeps a removal only when that count stays at one.
Frequently asked questions
What do the dots mean?
A dot is an empty cell waiting for a digit. Every row, column, and 3 by 3 box must end up holding the digits 1 to 9 exactly once.
Which difficulty should a beginner pick?
Easy, with the fewest empty cells and the most starting clues to work from.