One Line: Number Path Puzzle
A fair daily one-stroke puzzle
Free · In‑App Purchases
A fresh puzzle every day. Trace the numbers in order and fill every square with one continuous line. Always exactly one solution. No account, fully offline.
One line. Every square.
A calm, surprisingly deep path puzzle: trace the numbers in order — 1, 2, 3 — and fill the whole grid with a single stroke.
A fresh daily puzzle turns spare minutes into the perfect little brain break.
■ How to play
- Start your line at 1
- Pass the numbers in order: 1 → 2 → 3 …
- Visit every open square exactly once (dark blocks are walls)
- Finish on the last number. Drag back to erase, or touch any point on your line to redraw from there
■ Why you'll like it
- Always fair: every board is checked by a solver, so there is exactly one solution — no guessing
- Endless boards: puzzles are generated on your device and prepared in advance, so there's no waiting
- Daily puzzle: the same board for everyone each day — build your streak
- Four difficulties: gentle 6×6, 7×7, hard 8×8 and a fiendish 8×8
- Ranks: climb from Novice to Grandmaster; harder boards count for more
- Progress: clears, streaks, best times and no-hint rate
- Dark mode, in English and Japanese
■ Made for you if…
- You want a quick, satisfying "solved!" on a commute or coffee break
- You love logic puzzles but dislike ambiguous ones
- You'd like a small daily habit that keeps your mind moving
- You prefer a clean, quiet, grown-up design
■ Private by design
- No account or sign-in
- Your progress stays on your device and is never sent to a server
- Puzzles are generated and played offline
- The only network use is reading public App Store information to show other apps from the same developer
- No third-party ads or tracking
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Now optimized for iPhone Duo and iPad.
Minor improvements.
The developer, torankirite, 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 indicated that this app doesn’t support certain accessibility features. Learn More about the accessibility features.
Information
- Seller
- torankirite
- Size
- 1.4 MB
- Category
- Puzzle
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Premium $4.99
- Copyright
- © 2026, Torankirite