Single Line: Drawing Puzzle
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Line RiderBack to the main gameSingle Line: Drawing Puzzle is a browser-based logic game where you trace each shape in one continuous stroke without lifting your hand, crossing back over the line, or releasing mid-draw. It is free to play here with no download, on desktop or mobile. Levels start with simple outlines like a heart or a boat and gradually grow into intricate designs that require a plan before you put pen to paper. There is no timer, so you set the pace.
What is Single Line: Drawing Puzzle?
Single Line is a 2D logic puzzle game built around one constraint: complete each shape in a single unbroken stroke. You cannot lift your hand, retrace a segment, or cross the line over itself. If you release the mouse or your finger before the shape is finished, the level resets automatically.
The game belongs to the same family as Eulerian path puzzles, where the challenge is finding a valid route through every edge exactly once. Early levels are short enough to solve by feel. Later ones push you to mentally map the path before you start.
How to draw each shape
Click or tap a starting point on the outline, then drag continuously to trace the full shape. Release only when every segment is covered.
| Action | Desktop | Mobile |
|---|---|---|
| Start stroke | Click and hold on the shape | Tap and hold on the shape |
| Draw | Drag the mouse along the outline | Drag your finger along the outline |
| Release / restart | Release the mouse button | Lift your finger |
How levels change as you progress
Each level introduces a new shape with a different number of segments and junction points. Complexity rises as the designs add more intersections and longer routes.
| Stage type | What to expect |
|---|---|
| Early levels | Simple closed shapes, one or two obvious entry points |
| Mid levels | More segments, some dead-end corners that force backtracking |
| Later levels | Complex outlines where only one or two entry points lead to a valid path |
Tips for tracing the harder shapes
- Count the odd-degree vertices before you start. In Eulerian path logic, those are the only valid start and end points.
- If a corner has three or more lines meeting it, you probably need to pass through it more than once, which is not allowed. Check whether you are approaching it from the right direction first.
- Dead ends must be the first or last segment you draw. Tackle them at the very start or save them for the finish.
- When stuck, restart and try the opposite end of the shape as your entry point. A mirrored route often works when the obvious one does not.
Playing on desktop and mobile
The game runs in any modern browser with no install needed, and it is free. The drawing controls translate naturally to touchscreens, so the mobile experience is close to the desktop one. Because there is no timer, it works well in short sessions wherever you have a few minutes.