One Line

One Line is a calm, minimalist logic puzzle game. Touch the green dot, drag your finger along the lines, and draw one continuous stroke that uses every line exactly once. No lifting, no retracing, no timers to beat, no reflexes needed. Just you, a clean board, and a satisfying "aha".

EASY TO LEARN, HARD TO MASTER
The first puzzle takes ten seconds. By the end of the campaign you will be planning routes through crossings, checkpoints, numbered dots and strict move limits. New rules are always explained the first time you meet them.

300 CAMPAIGN PUZZLES
Ten chapters of thirty puzzles each, with difficulty that rises gradually:
- First Lines: learn to draw one unbroken line
- Turns: more dots, more corners, more choices
- Think Ahead: dead ends punish hasty lines
- Checkpoints: visit the diamonds; some lines are optional
- The Long Path: bigger networks, longer journeys
- Crossings: lines may cross, but only dots connect
- Order Matters: reach numbered dots in sequence
- Limited Moves: every move counts
- Expert Paths: everything combined
- Mastermind: the toughest puzzles in the game

Every campaign puzzle is checked by a solver, so every one of them can be solved.

DAILY CHALLENGE
A new puzzle every day, the same for everyone on the same date, and it works offline. Build a streak and see your best time.

ENDLESS MODE
Pick Beginner, Easy, Medium, Hard or Expert and get a fresh, verified puzzle every time. Track your best streak.

HINTS THAT ACTUALLY HELP
Stuck? Tap Hint to see the next move, tap again for the next few lines, and once more for the whole route. Hints work from the line you have already drawn, and tell you honestly when you need to undo.

DESIGNED TO BE PLEASANT
- Smooth, forgiving touch controls that snap to the line you mean
- Undo, restart and pause at any time; drag back to step back
- Your unfinished puzzle is saved automatically, even if the app is closed
- Light, dark or system theme
- Reduced-motion option, optional sound and haptics
- Screen-reader support with accessible alternatives to dragging
- Statistics, history and 10 achievements to collect

PLAY ANYWHERE
One Line works fully offline. No account, no sign-up, no waiting. Progress and statistics are stored on your device.

The game contains banner ads on menu screens. There are never ads while you are solving a puzzle.

Open the app, touch the green dot, and draw.