Sudoku
Six levels graded by the solving techniques a puzzle really needs, not just its clue count. Play the daily challenge for monthly medals, learn every technique on real boards, and type in a puzzle from the newspaper. No account, and ads never interrupt a puzzle.
- 🔢 Easy to Extreme
- 📅 Daily challenge
- 💡 19 technique lessons
- ✈️ Plays offline
Ways to play.
Every puzzle has exactly one solution, and its level comes from the hardest technique you need to solve it.
Classic
Six levels, from Easy to Extreme. Pick up where you left off at any time.
Daily challenge
A puzzle for every day on a month calendar. Solve 10 for bronze, 20 for silver and every day for gold.
Seasonal events
A themed event every month: ten puzzles rising from Easy to Extreme, with a trophy for finishing them all.
Learn
Every one of the 19 techniques taught on real boards: the position, the pattern, then the result.
Custom puzzles
Type in a puzzle from a newspaper or paste 81 digits. The app checks it has exactly one solution and grades its level.
Sudoku, done properly.
Hints that teach
A hint names the technique, explains the reasoning for that exact cell and highlights the cells involved, with a link to its lesson.
Notes and colours
Pencil marks with auto-remove and auto-fill, six colour markers, number-first input, and undo and redo that survive a restart.
Medals and achievements
Monthly medals, 26 achievements and statistics for every level, with a score that rewards a flawless, hint-free solve.
Four looks
System, light, dark and a warm sepia that feels like a newspaper puzzle, with five accent colours, on phones and tablets.
Ads that wait their turn
Ads never interrupt a puzzle, and a full-screen ad shows only after every third finished game. The game stays playable without ever watching one.
Made for everyone
Every cell is read out by screen readers, animations follow your reduce-motion setting, and layouts are tested at large text sizes.
Six levels, 19 techniques.
Levels rise with the techniques they need. Each one you meet has its own lesson.
6 levels
- Easy
- Medium
- Hard
- Expert
- Master
- Extreme
19 techniques to learn
- Last free cell
- Hidden single
- Naked single
- Naked pair
- Pointing
- Box-line reduction
- Naked triple
- Naked quad
- Hidden pair
- Hidden triple
- X-Wing
- XY-Wing
- Swordfish
- Skyscraper
- 2-String Kite
- XYZ-Wing
- W-Wing
- Simple Coloring
- Jellyfish
Questions, answered.
Is Sudoku free?
Yes. Sudoku is free to play, and ads pay for it. There are no purchases, and every feature works without watching an ad.
Do ads interrupt a puzzle?
No. Ads never appear over the board or in the middle of a game. A full-screen ad shows only after every third finished game.
How are the levels graded?
By the hardest technique a puzzle needs, worked out by a human-style solver, not just by how many clues it has. Easy needs only singles; Extreme needs chains or trial and error.
Does it work offline?
Yes. Every mode works without internet. Ads only show when you're connected.
Can I move my progress to a new phone?
Yes. Your phone's own backup includes it, or use Settings › Backup & restore to make a code and enter it on the new device.
Which devices are supported?
Android 7.0 and newer, and iPhone and iPad with iOS 15 or newer.
Ready for a good puzzle?
Sudoku is almost ready. Join the list and we'll let you know the day it lands.