spatial · logic · 1–3 minutes
One Stroke
Trace the whole graph in one continuous path.
Start at
> Level 1: Small shapes on a 3×3 grid, 5 to 8 lines
No runs yet
How to play
- 01Draw every line exactly once without lifting the pen.
- 02Start anywhere: drag through the nodes to draw, or tap them one at a time.
- 03Nodes can be passed through as often as you like. Lines cannot be drawn twice.
- 04From level 41 some lines are one-way, marked with an arrow, and can only be drawn that way.
- 05From level 61 the stroke has to finish where it started.
- 06If nothing runs on from where you are, Undo lifts the last line. Drawing the whole shape without undoing is perfect.
- 07You have three lives. Running out of time costs one and draws a fresh shape.
- 08On a keyboard: the arrow keys draw toward a node, Space puts the pen down, and Backspace lifts a line.
Levels
- 1–20 · Beginner
- Small shapes on a 3×3 grid, 5 to 8 lines
- 21–40 · Focused
- Diagonals and crossings, 9 to 12 lines
- 41–60 · Sharp (Plus)
- Bigger shapes with one-way lines, up to 16
- 61–80 · Expert (Plus)
- Loops: the stroke has to come home, up to 19 lines
- 81+ · Master (Plus)
- 5×5 shapes, up to 24 lines, most of them one-way
About
One Stroke is the classic pen-and-paper puzzle: a shape you have to draw in a single line. Every shape here is generated by walking it, so there is always at least one way through.
Where you start matters. On most shapes only two nodes can begin a stroke, and picking either of the others strands you.
Shapes grow from a 3×3 grid to 5×5, gain crossings and one-way lines, and from level 61 have to be drawn as a loop.
Tips
- > Count the lines at each node. A node with an odd number must be where you start or where you finish.
- > If every node has an even count, you can start anywhere, but you'll always end where you began.
- > Draw the awkward corners early, while you still have a way back.
- > One-way lines are the tightest constraint on a board. Plan around them first.
- > Undo only costs time, so try a promising route rather than standing still.
FAQ
Can every shape be drawn?
Yes. Each shape is generated by drawing it, so a full stroke always exists. Where you start is up to you, and it's usually the hard part.
Why won't a line draw?
Either it's already drawn, it's one-way and you're going against the arrow, or there is no line between those two nodes at all.
My finger slipped. Is the attempt over?
No. Lifting your finger doesn't end anything. Carry on dragging or tapping from where the pen is.
Is it free?
Yes. Every level is free to play in your browser, with no account and nothing to download.