Weekly Quests
Fresh objectives each week — solve X puzzles, finish on Y accuracy — with rewards to keep sessions purposeful.
SudokuZen v1.0.0
A calm Sudoku ritual for a sharper mind
SudokuZen turns a few minutes of daily puzzle-solving into a gentle brain workout — with 500 handcrafted classic levels across five difficulties, a Daily Challenge that rewards consistency, and unlimited quick games for when you have a spare minute.
500+
Classic levels
1,500
Stars to collect
5
Difficulties
∞
Quick games
Classic Levels
500 handcrafted puzzles across five difficulties
Every classic board is carefully generated and reviewed for a fair, satisfying solve. Start easy, build confidence, and push yourself toward the hard boards.
Easy · 100
Medium · 100
Hard · 100
Expert · 100
Zen · 100
- Star ratings — earn up to three stars per level based on accuracy.
- Instant feedback — conflicts are flagged the moment they appear.
- Auto-save — pick up exactly where you left off, any time.
A classic board in progress
53..7....
6..195...
.98....6.
8...6...3
4.8...3.1
7...2...6
.6....28.
...419..5
....8..79
Earn up to 3 stars per level for clean, accurate solves.
Daily Challenge
One puzzle a day. A streak worth keeping.
Each day brings a fresh, specially selected puzzle. Solve it to keep your streak alive and collect daily rewards — consistency is the whole game here.
- Gentle reminders — optional local notifications at 8 PM and 11 PM, never pushy.
- Streak tracking — watch your daily chain grow, one solved puzzle at a time.
- No pressure — you set the pace; there's no timer watching you.
Your streak
12 days
M
T
W
T
F
S
S
A fresh challenge every day — your streak is saved on your device.
Quick Games
Unlimited quick games, three compact grids
Perfect for a commute or a coffee break. Choose from 4×4, 6×6 and 8×8 boards that solve in minutes — unlimited quick games for everyone, no paywall needed.
4×4starter
6×6balanced
8×8spicy
- Unlimited quick games — play as many as you want, no daily limits.
- Unlimited quick games — play as many as you want, no daily limits.
Brain Passport
See yourself get better at Sudoku
SudokuZen quietly measures six skills in every solve and blends them into a personal Brain Passport — plus a Solver Identity that summarizes your style. Earn XP with every game, level up your Brain Level, and watch your profile evolve as you play.
- Six traits — Logic, Accuracy, Focus, Speed, Consistency and Recovery.
- Solver Identity — a one-line summary of how you play.
Your traits
-
Logic92
-
Accuracy88
-
Focus81
-
Speed74
-
Consistency85
-
Recovery79
Solver Identity: "The Steady Strategist"
More ways to play
Small details, thoughtfully tuned
Progress & Stats
Total puzzles, stars, best streaks and trait history — all stored locally and always available offline.
Calm by design
A dark, low-glare theme and soft sounds tuned to keep you relaxed and focused — never frantic.
FAQ
Questions, answered
Yes. The game is completely free to download and play with no time limits, no subscriptions, and no in-app purchases. Optional ads help fund development.
No. SudokuZen has no accounts and no sign-up. All progress is saved locally on your device.
Yes. Every puzzle — classic levels, daily challenges and quick games — can be solved with no internet connection at all.
Reminders are local notifications scheduled at 8 PM and 11 PM to nudge you toward the Daily Challenge. They never contain ads, can be disabled in settings, and your data never leaves your phone.
SudokuZen shows occasional non-intrusive ads (banner, interstitial and rewarded hint videos) to help fund development. There are no in-app purchases or subscriptions.
Six traits — Logic, Accuracy, Focus, Speed, Consistency and Recovery — are scored from your solving behavior across every game mode. Everything is computed and stored on your device.
We're sorry about that! Please email us at techsangeetha2109@gmail.com with your device model and what happened — we'll take a look.
Start your streak today
SudokuZen is free on the Google Play Store. Download it, solve today's challenge, and start a streak that makes your brain feel sharper.