Graded by Technique
Difficulty is the hardest technique a puzzle needs, rated by the Sukaku Explainer: five ranked circles from Sharp to Infernal, plus an unranked Warm-up.
Available on Google Play
Sudoku Graded by the Technique,
Not the Blanks
Every puzzle is rated by the hardest technique it needs, from pairs and pointing to chains and forcing, and step-by-step hints and lessons teach what you are missing.
- Puzzles, no repeats
- 6,000
- Techniques to learn
- 22
- No account
- Offline
Screenshots
See It in Action
Real screens from the app, not mock-ups.
Features
Built for People Who Know the Basics
Every feature below is in the app today.
6,000 Puzzles, No Repeats
A ranked puzzle is never dealt twice. A Daily puzzle, the same for everyone on the same day, comes with a streak and a Freeze to protect it.
Lives Are Rules
Ranked gives three lives, Precision gives one with no undo and no check, Practice is unlimited and never counts. Turning off wrong-digit highlighting never changes the rules.
Hints That Teach
Four steps: a move exists, which technique, the pattern on the board, then the digit. The first three never touch your rating; the digit marks the solve as assisted.
Learn From Real Positions
Twenty-two techniques to learn, each with an example found in a real puzzle, shown only when you press Show me.
Your Rating, On Your Device
A rating that moves with every clean ranked solve, a chart, and your time against par. Works fully offline; there is no account to make.
How It Works
Descend One Circle at a Time
Ranked play that teaches as it goes.
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Pick Your Circle
Five ranked circles from Sharp to Infernal, plus an unranked Warm-up.
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Ask for a Hint
A move exists, which technique, the pattern, then the digit. Only the digit marks the solve as assisted.
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Watch Your Rating Move
Every clean ranked solve moves your rating. Win your way one circle deeper.
Pricing
The Whole Game, Free
Free
With ads
- 6,000 puzzles, never dealt twice
- Hints, lessons and your rating
- This month’s Daily
Pro
One-time purchase
No subscription
- No ads
- Every earlier month of the Daily
- Continue with one life, no video
- Rescue a streak once, no video
Hint packs are also sold on their own.
Languages
Available in English
The app is in English.
English
Privacy
Your Game Lives on Your Device
What the app does with your data, in plain words. The full details are in the privacy policy.
No Account
No sign-up and no server of its own. Your puzzles, times and rating stay on your device.
Works Offline
The game works fully offline, except for loading ads and checking a purchase.
Ads by Google AdMob
The free app shows ads from Google AdMob, which uses your advertising ID. AdMob never receives your puzzles, times or rating.
Purchases via Google Play
Pro and hint packs are sold through Google Play. We never see your payment card details.
Good to Know
Before You Install
- Works fully offline, except for loading ads and checking a purchase.
- Hints are kept on this phone; Pro comes back from Google Play on any phone.
- The app is in English.
- Android 7.0 or later.