Play Free Online Sudoku
Select a level and start solving
Free to play · No login or sign-up · Kids & family friendly
Puzzles are generated dynamically with a unique solution.
Did you know?
Every puzzle has a unique solution
Pro Sudoku generates puzzles on the fly and checks that each one has exactly one valid solution.
Difficulty comes from clues, not guessing
Harder levels use fewer givens and require techniques like pairs, triples, and X-Wing instead of trial and error.
Notes turn hard puzzles into logic
Use notes to track candidates in each cell and reveal patterns like hidden singles and pointing pairs.
Quick questions
Is it free?
Yes. No payments or sign-up. Play as much as you like.
Safe for kids?
Yes. Family friendly, no inappropriate content.
Need an account?
No. Just open the site and pick a difficulty.