What is Sudoku Generator?
This sudoku generator creates and plays standard 9x9 sudoku puzzles right in your browser. Hit Generate for a fresh puzzle at one of three difficulties — easy (38 givens), medium (46), hard (54) — and every puzzle is guaranteed to have exactly one solution. Mistakes are flagged in red as you type, a built-in timer tracks your solve time, and a hint button reveals the correct digit when you are stuck. No signup required; generation and validation all happen locally, so nothing is uploaded. Great for daily practice, casual play, and classroom use.
▶Use Cases5 scenarios
- ◆Daily sudoku practice
- ◆Casual brain training on the go
- ◆Improving logical reasoning
- ◆Classroom exercises and tests
- ◆Timed speed-solve challenges
▶How to Use5 steps
- 1Pick a difficulty: easy / medium / hard
- 2Click Generate New Puzzle
- 3Select a cell and enter a digit from 1 to 9
- 4Wrong entries are flagged red in real time
- 5Finish to auto-check and see your time
▶Features8 features
- ✓Free
- ✓No signup
- ✓Three difficulty levels
- ✓Unique solution guaranteed
- ✓Live error checking
- ✓Built-in timer
- ✓Hint system
- ✓Generated locally
▶FAQ7 questions
What is a sudoku generator?
An online tool that generates and plays standard 9x9 sudoku puzzles. Input: a difficulty choice — easy (38 givens), medium (46), hard (54). Output: a puzzle with a guaranteed unique solution, playable with a timer, hints, and live error checking. Used for practice, entertainment, and teaching. Everything runs locally in your browser — no uploads.
How many difficulty levels are there?
Three: easy (38 givens), medium (46), and hard (54). Fewer givens means a harder puzzle.
Is every puzzle guaranteed to have one solution?
Yes. The generator builds a complete solution first, then removes digits while verifying that exactly one solution remains.
What happens if I make a mistake?
Wrong entries are highlighted in red in real time and can be corrected. When all cells are filled, the tool auto-checks your result.
Is there a timer?
Yes. The timer starts when a puzzle is generated and shows your total time on completion — handy for speed challenges.
What if I get stuck?
Click Hint and the tool fills the selected cell with the correct digit. Hints are unlimited.
Is my data uploaded?
No. Puzzle generation and validation happen entirely in your browser, with no server involved.