Calm Sudoku.
Daily focus.
A free Sudoku app for iPhone and Android. Play 4×4 to 12×12 puzzles, tackle daily challenges, and build your streak — all in a clean, distraction-free design.
Everything you need for daily Sudoku
SudoZen strips away the noise and delivers a focused puzzle experience — no ads interrupting your flow.
Multiple Board Sizes
From quick 4×4 sessions to the demanding 12×12 master board. Pick the depth that fits your mood.
Daily Challenges
A fresh puzzle every day. Complete it to earn XP, extend your streak, and log your solve time.
Notes & Hints
Notes mode, hints, undo, and erase — all the tools you need, nothing that gets in the way.
Four sizes, one calm experience
Whether you have two minutes or two hours, there’s a board that fits.
Progression without pressure.
SudoZen gives players a reason to come back, but keeps the center of gravity on the puzzle. XP, streaks, achievements and history sit around the game — not on top of it.
Clean by design
Every screen is built around clarity. No clutter, no distractions — just your puzzle.
Built for daily use
Small details make the difference when you open an app every day.
🔥 Streaks & XP
Complete daily challenges to build your streak and earn XP. Your history and best solve times are always tracked.
📦 Works Offline
All puzzles are available without an internet connection. Only syncing and the daily challenge require connectivity.
🎨 Clean Interface
Zero clutter. Every design decision prioritizes your focus — no popups, no banners, no noise.
🆓 Free to Play
SudoZen is free to download and play on both iOS and Android, with no paywalls on core gameplay.
Questions about SudoZen
Everything you need to know before downloading.
Is SudoZen free to download?
Yes. SudoZen is free on both the App Store and Google Play. No upfront cost, no paywall on the core game.
What board sizes are available?
SudoZen offers four sizes: 4×4 Quick (2–5 min), 6×6 Focus (short breaks), 9×9 Classic (regular play), and 12×12 Master for deep-focus sessions.
Is SudoZen available on Android?
Yes. SudoZen is available on both iOS (App Store) and Android (Google Play). The experience is consistent across both platforms.
How does the daily challenge work?
Every day a new puzzle is available. Completing it earns XP, extends your streak, and logs your solve time in your history. Miss a day and the streak resets — no pressure, just a reason to return.
Does SudoZen have hints?
Yes. SudoZen includes hints, an undo button, notes mode, and an erase tool. Hard puzzles are approachable, not frustrating.
Can I play offline?
Yes. All puzzles work fully offline. An internet connection is only needed to sync progress and unlock the daily challenge.
Sudoku guides, tips & research
Short reads to help you solve faster, play smarter, and build a daily habit.
Sudoku for Beginners: A Complete Guide
Rules, logic, board sizes and the habits that turn first-timers into confident solvers.
Read article → GuideHow to Solve a 9×9 Sudoku Step by Step
Scanning, cross-hatching, naked pairs — every technique for any difficulty level.
Read article → Lifestyle7 Benefits of Playing Sudoku Every Day
Memory, focus, stress relief and more — what the research says about a daily puzzle habit.
Read article →Start your streak today.
Download SudoZen for free on iOS and Android. Your first daily challenge is waiting.
