Tertiary Sudoku
Classic number puzzles
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Unlimited Sudoku with four difficulty levels, smart hints, pencil notes, haptics, and local score & time tracking - all offline, now for ages 14+.
Tertiary Sudoku is a clean, offline number-puzzle game for players aged 14 and up. Every puzzle is generated on your device with a guaranteed unique solution, so you never run out and never see the same grid twice. Choose from four difficulty levels - Easy, Medium, Hard, and Expert - and solve at your own pace.
- Four difficulty levels, from gentle warm-ups to ruthless Expert grids
- Smart hints whenever you ask - reveal the right number for any cell
- Pencil notes (candidates) with optional auto-cleanup
- Conflict and same-number highlighting you can toggle on or off
- Optional 3-strike challenge mode for mistake-free runs
- A timer, scoring, and full game history kept entirely on your iPhone
- Stats tab with your best times and scores per difficulty
- Feedback and About tabs built right in
- 100% offline and private - nothing ever leaves your device
Track your best times and scores per difficulty, resume any game you leave, and train your brain one grid at a time.
Ratings & Reviews
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Now for ages 14 and up!
• Simplified one-tap age confirmation — no ID, no verification
• New bottom navigation: Home, Stats, Feedback, and About
• Stats tab — your scores, best times, and full game history, always one tap away (stored only on your device)
• Feedback tab — send us your ideas via WhatsApp
• Easier play: clearer selected-cell highlight, a bigger number pad, and gentle haptic feedback
• The Continue card now shows the difficulty and time of your saved game
The developer, Alfred Ang, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Alfred Ang
- Size
- 1.3 MB
- Category
- Puzzle
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Copyright
- © 2026 Tertiary Infotech Academy Pte Ltd