Sudoku: classic logic puzzle
A clean, distraction-free Sudoku for iPhone and iPad — pencil notes, hints, show, check, and a built-in strategy guide, all at your fingertips.
Features
Pure logic
Every puzzle has exactly one solution and can be solved by logic alone — you never need to guess.
Five difficulty levels
Play from Simple to Expert. Each level caps the hardest solving technique a puzzle will ever require, so the challenge grows gradually.
Pencil notes
Jot down candidates in any cell without committing. Switch between pencil mode and final entry with a single tap.
Hint, Show & Check
Stuck on a cell? Hint points you to a good next move, Show fills it in for you, and Check highlights any wrong digit currently on the board.
Built-in strategy guide
Learn the classic solving techniques — from Naked Singles and Hidden Pairs up to X-Wing, XY-Wing, Coloring and Forcing Chains — right inside the app.
Challenge Mode
Disable all help and put your skills to the test. Wrong entries are flagged immediately — three mistakes and the game ends.
Light & dark mode
Follow your system appearance or force light or dark mode. The 3×3 boxes stay clearly visible in either theme.
Private statistics
Track your solves, win rate, best and median times, and a per-difficulty breakdown. Your numbers stay in your own iCloud — nobody else can see them, and you can erase them anytime.
iCloud sync
Your statistics sync across your iPhones and iPads via your private iCloud, and your preferences do too once you turn on settings sync. The in-progress puzzle stays on the device you’re playing on — each device resumes the game it last saved.
Screenshots
Game view
Hint
Strategy
Statistics
Help & strategies
Facts at a glance
- Name on the App Store
- Sudoku Traditional Puzzle Game
- What it is
- A classic 9×9 Sudoku without ads, with five difficulty levels, pencil notes, hints and a built-in strategy guide
- Developer
- Detlev Voss, independent developer, Berlin, Germany
- Platforms
- iPhone (incl. iPhone Duo) and iPad
- Requirements
- iOS 26 or iPadOS 26, or later
- Available since
- June 2026
- Current version
- 1.2.0 (November 2026)
- Puzzles
- Five difficulty levels, from Simple to Expert. Every puzzle has exactly one solution and can be solved by logic alone.
- Price
- Free, with no ads and no subscription. An optional tip jar supports development and unlocks nothing.
- Languages
- English, German
- Category
- Games (Board, Puzzle)
- Privacy
- No analytics, no tracking, no ads. Your statistics stay on your device and in your private iCloud.
Sources
Where to check the facts above.
- Sudoku Traditional Puzzle Game on the App Store: price, version, requirements and languages
- Sudoku user guide: rules, controls and the solving techniques in the strategy guide
- How to start any Sudoku: the first steps into a new puzzle, on the blog
- Privacy Policy: what stays on your device and in your iCloud