Sudoku Puzzle Generator
Generate unlimited, unique, and printable Sudoku puzzles from Easy to Expert difficulties online for free.
How to use the online Sudoku generator
Select your desired difficulty level (Easy to Expert) and click "Generate New Puzzle". This random sudoku generator uses a randomized backtracking algorithm to build a unique, mathematically valid Sudoku grid every single time — no two puzzles are ever the same. You can play directly on screen or click "Print Puzzle" to solve it on paper.
Example
Selecting "Medium" difficulty generates a 9x9 grid with roughly 30-35 clues filled in, leaving the rest for you to solve.
Common Use Cases
- Printing a fresh puzzle for a classroom or puzzle book.
- Playing Sudoku directly in the browser without an app or sign-up, as an online sudoku generator.
- Using it as a sudoku game generator for a puzzle night, needing a fresh grid on demand.
- Generating an unlimited supply of random puzzles at a chosen difficulty for practice.
FAQs
Does every generated puzzle have a unique solution?
Yes — the generator guarantees each puzzle has exactly one valid solution.
Is this a random sudoku generator?
Yes — every puzzle is built by randomly filling a valid 9x9 grid with a backtracking algorithm and then randomly removing numbers to match your chosen difficulty, so no two puzzles are the same.
Can I play this online sudoku generator directly in the browser?
Yes — the puzzle is generated and displayed instantly on the page. There's nothing to install; just pick a difficulty and start filling in the grid on screen, or print it to solve on paper.
What difficulty levels does this sudoku game generator support?
Four levels — Easy, Medium, Hard, and Expert — each removing a different number of starting clues from the solved grid, from roughly 30 blanks on Easy up to 60 on Expert.