A puzzle you understand in seconds
One Line asks you to visit every enabled cell exactly once. Levels gradually add start cells, end cells, walls and directional constraints.
The reward is the moment the route becomes clear: one line, no missed cells, no wasted move.
Built for quick breaks and longer streaks
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More than 300 levels
Official worlds grouped by difficulty, with a clear sense of progression.
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Daily Challenges
A fresh challenge every day to keep the puzzle ritual alive.
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Playable on the web
Start directly in your browser with no required account.
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Available on Android
Install One Line from Google Play for a faster mobile experience.
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Level creation
Build your own grids and automatically test whether they can be solved.
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More in progress
Duels, community content and progression improvements are in development.
Created in Quebec
One Line is developed by Maxime Manseau, an independent developer in Quebec. The game is designed to feel calm, readable and satisfying on mobile, without unnecessary noise.