Sudoku:Zen

Slow down. Start with one number.

Sudoku Zen creates a calm, uncluttered space for classic Sudoku on iPhone. Whether you are learning the rules or taking a focused break, choose a puzzle and solve it at your own pace.

SIX LEVELS OF CLASSIC SUDOKU

Choose Easy, Medium, Hard, Expert, Master, or Extreme at any time.
Every generated puzzle has a unique solution.
Highlight related cells and matching numbers, and see how many of each number remain.
TOOLS THAT SUPPORT YOUR THINKING

Add candidate notes, erase entries, and undo moves.
Automatically remove matching notes from related cells after a correct entry.
Use free hints that explain logical singles when available, or reveal a cell when needed.
Turn mistake checking on or off, with an optional three-mistake limit.
Hide the timer or pause whenever you need a break.
A DAILY CHALLENGE

Play a consistent puzzle for each day based on your device’s local date.
Return to past dates from the calendar and track your monthly progress.
Keep every Daily Challenge separate from your Classic game.
LOCAL SAVES AND USEFUL STATISTICS

Automatically save numbers, notes, undo history, and active play time on your device.
Continue your Classic game or any unfinished Daily Challenge later.
Review completed games, best scores, mistake-free wins, best times, and average times.
MAKE IT YOURS

Use the app in English or Simplified Chinese.
Choose Light, Dark, or System appearance.
Adjust haptics, timers, highlighting, automatic note cleanup, and mistake checking.
LOCAL PROGRESS AND OFFLINE PLAY

No account required.
No in-app ads or in-app purchases.
Core Sudoku gameplay is available offline.
Keep your puzzles, preferences, and game statistics locally on your device.
Sudoku Zen does not currently provide cloud sync. Uninstalling the app or erasing device data may permanently remove local progress and statistics.

A little patience. A moment of clarity.