Fill One: Line Brain Puzzle
Casual
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Looking for a simple yet deeply addictive way to sharpen your mind? One Stroke Master brings you the most comprehensive brain-training experience with a staggering 3,200 levels to conquer. Best of all? It’s completely free to play!
WHY YOU'LL LOVE ONE STROKE MASTER:
Whether you're on your daily commute or winding down before bed, spending just a few minutes a day with this puzzle will help keep your brain active and focused.
HOW TO PLAY:
The rule is elegantly simple: Fill all the blocks using just one continuous line. Don't worry about getting stuck—free hints are always available to help you navigate through the most complex patterns.
CHALLENGE YOUR LIMITS:
Progress through four escalating difficulty tiers:
Beginner: Get the hang of the mechanics.
Expert: Start testing your logic.
Professional: For those who love a serious challenge.
Master: "Impossible" difficulty for true puzzle geniuses.
THE MATHEMATICAL ORIGIN:
Inspired by the famous "Seven Bridges of Königsberg" problem from the 18th century, one-stroke puzzles are more than just games—they are mathematical exercises proven to boost work efficiency and prevent mental aging.
GAME FEATURES:
3,200 Levels: The largest collection of one-line puzzles on the store.
4 Difficulty Modes: Tailored for all skill levels.
Free Hints: Never feel frustrated; help is just a tap away.
Minimalist Design: Clean, distraction-free UI to help you focus on the logic.
Offline Play: No internet? No problem. Train your brain anywhere, anytime.
Step into the world of logic and see if you have what it takes to master all 3,200 levels. Download One Stroke Master today!
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Optimized Game Features
The developer, Nhung Thi Lam Thi, 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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Nhung Thi Lam Thi
- Size
- 83.6 MB
- Category
- Casual
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © @2026 Nhung Thi Lam