Sudoku
The classic 9×9 logic puzzle
Sudoku is the world's most popular logic puzzle: fill the grid so every row, column, and box contains each digit exactly once. No maths and no guessing — every puzzle has exactly one solution, reachable by pure deduction.
How to play
- Fill every row, column, and box with each digit exactly once.
- Use elimination to find the only digit that can go in a cell.
- Drop into pencil mode to jot candidate marks while you reason.
- Stuck? A hint reveals the next solvable step — at a cost to your score.
What it trains
Sudoku is rule-based deduction in its purest form — the logic domain, where Apexwit players' in-game scores rise by up to +113%. Explore Logic training →
Improvement figures are observed in-app score gains, backed by peer-reviewed cognitive-training research.
Difficulty
Boards run from a gentle 4×4 through 6×6 to the full 9×9, where you'll need advanced techniques like naked pairs and pointing.
Related Logic games
Free to play · No signup required · Works on web, iOS & Android
Want to save your progress across devices? Create a free account →Frequently asked questions
Is Sudoku free to play?
Yes — Sudoku is completely free on Apexwit, with every difficulty level unlocked, no ads and no signup required. An optional subscription only adds cloud backup so your scores and streaks sync across devices.
Do I need an account to play Sudoku?
No. You can play Sudoku instantly on the web or in the iOS and Android apps — no signup needed. You only create an account if you want to back up and sync your progress across devices.
What does Sudoku train?
Sudoku is rule-based deduction in its purest form — the logic domain, where Apexwit players' in-game scores rise by up to +113%.
What devices can I play Sudoku on?
Apexwit runs in any modern web browser and as an app on iOS and Android, so you can play Sudoku on a computer, phone or tablet — and pick up where you left off when you sync your progress.