Single Stroke Line Draw
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Line RiderBack to the main gameSingle Stroke Line Draw is a puzzle game where the goal is simple: draw each shape in one unbroken line. You cannot lift your finger (or mouse), and you cannot cross or retrace a segment you have already drawn. It runs entirely in the browser, free to play, and works on any device including school or work computers where downloads are blocked.
What is Single Stroke Line Draw
This is a Eulerian path puzzle game. Each level shows you an outline or a geometric figure, and you must trace every edge of it exactly once without lifting your cursor. The challenge is figuring out where to start so the path does not dead-end before every line is covered. Levels start with basic shapes and gradually introduce more complex figures with multiple junction points.
How to draw each shape
Click or tap a starting node, then drag or tap adjacent nodes in sequence. Release when the shape is complete. If you get stuck, tap Reset to start that shape again.
| Action | Mouse | Touch |
|---|---|---|
| Start a stroke | Click a node | Tap a node |
| Extend the path | Click the next connected node | Tap the next node |
| Reset current shape | Click the Reset button | Tap Reset |
| Go to next puzzle | Completes automatically on success | Completes automatically on success |
Puzzle types and difficulty curve
Puzzles are sorted from beginner outlines to dense multi-node graphs. The table below shows what to expect at each stage.
| Stage | Shape type | Key challenge |
|---|---|---|
| Beginner | Simple polygons (triangle, square) | Finding any valid starting node |
| Intermediate | Stars and compound shapes | Avoiding dead-end branches |
| Advanced | Dense graphs with many junctions | Choosing the correct entry and exit nodes |
| Expert | Irregular webs | Tracing the Eulerian path through multiple crossings |
Tips for solving harder puzzles
A few patterns help when shapes get complicated.
- An Eulerian path exists only when the shape has exactly 0 or 2 nodes with an odd number of connected edges. If there are 2 odd nodes, you must start at one and finish at the other.
- If you keep hitting a dead end in the same spot, back up mentally and try entering that section from the opposite direction.
- On star shapes, alternate inside and outside points rather than going around the perimeter.
Scoring and progress
There is no timer by default, so you can take as long as you need. Progress is tracked by the number of puzzles completed in a session. The game does not penalize wrong attempts, so experimenting freely is part of the process.