One Stroke
✏️ One Line to Rule Them All
Trace the whole shape without lifting your finger and without redrawing a line. Levels are built from real graph theory and are always solvable.
✨ Features
- Endless levels generated with Euler-path logic
- Guaranteed solvable — parity is checked before a level ships
- Odd-node hints that tell you where to start
- Fast swipes never drop a line — drags are traced node by node
- Dead-end hints when your route runs out
- Your stroke is colour-graded in the order you drew it
- Undo for a wrong turn
- Touch and mouse drawing
- Original music & sound effects — one-tap mute toggle
🎮 How to play
- Start on a blinking dot (the level's odd node).
- Drag along the lines — each line can be used only once.
- Cover every line to complete the level.
Runs in any modern browser — desktop, tablet and phone. No download, no account, progress saved locally.
Part of BrainBox — free brain puzzle games that run in any browser. More puzzles coming soon!
