The longest line
Calm Water Line Puzzle
Free · Designed for iPad. Not verified for macOS.
Place one node, release the flow, and watch pastel lines compete across a calm geometric map.
The longest line is a calm single-player puzzle game about reading routes, placing one decisive node, and watching colored water spread through a minimalist groove map.
Each level begins with a quiet network of grooves and several rival color nodes already on the map. Choose any valid position for your blue node. Once the placement is confirmed, every color begins to flow through the connected channels. The winner is decided by which color controls the longest length of the route network when the flow settles.
The rules are simple, but the maps become more demanding over time. Early stages teach spacing, timing, and bottlenecks. Later stages ask you to read branches, overlaps, and competing sources before committing to a single placement.
Features:
- 50 progressively harder offline levels
- One-tap placement with strategic route control
- Flow-length victory rules that are easy to learn and satisfying to master
- Minimal flat vector art inspired by clean transit-map design
- Soft pastel colors, crisp lines, and a calm visual rhythm
- Relaxing music and responsive sound effects with audio toggles
- No account, no network connection, no ads, and no in-app purchases
The longest line is designed for quick thoughtful sessions: a small puzzle you can understand at a glance, then keep replaying until the perfect placement clicks.
Ratings & Reviews
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The developer, 俊灏 洪, 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
- 俊灏 洪
- Size
- 64.3 MB
- Category
- Games
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 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+
- Contains
Advertising
- Copyright
- © 2026 the longest line. All rights reserved.