About One Line Draw
One Line Draw is a small graph-traversal puzzle. Every level shows a pattern of nodes connected by edges. The goal is to draw a single, continuous line that touches every edge once and only once — no doubling back.
It is a quiet logic game. Most levels have more than one solution, so there is room to experiment. The patterns are small enough to feel approachable but tricky enough that an obvious-looking path often turns out wrong.
How to play
Start at any node, then drag along the edges to draw your line. Every edge must be covered exactly once, with no retracing.
| Desktop | Click a starting node, drag along edges |
|---|---|
| Mobile | Tap a starting node, drag along edges |
Tips & tricks
- Count edges before drawing — odd-degree nodes are almost always start or end points.
- If a level has more than two odd-degree nodes, it cannot be solved without lifting the pen.
- When stuck, reset the level and try starting from a different corner.
- Symmetric shapes often have symmetric solutions — mirror the half that works.
- Slow drags are more accurate than fast ones on touchscreens.
Frequently asked questions
What does One Line Draw test?
Graph traversal — it is a small, friendly puzzle based on Euler paths.
Are levels solvable from any starting node?
Not always. Many levels can only be completed if you start from one of the two odd-degree nodes.
Can I undo a wrong stroke?
Tap the reset button at the bottom to start the level over instantly.
Are there hints?
Some levels offer optional hints if you get stuck.
