One-Line Drawing

About One-Line Drawing

A one-stroke drawing puzzle. Each figure, from a simple triangle to the classic house-and-roof, is made of dots and lines, and you must trace every line exactly once without going back over one. Where you start matters: pick the wrong dot and you will get stuck. Fifty levels unlock one by one, a new figure arrives every day, and a hint shows a valid starting dot or the next safe line.

How to play One-Line Drawing

1. Touch a dot to start, then drag along the lines from dot to dot (or tap dots in order).
2. Each line can be drawn only once. Lines turn green as you draw them.
3. Draw every line to solve the figure. Stuck? Undo or restart.
4. Hints show where you can start, or the next line that still leads to a solution.

Tips and strategy

• Count the lines at each dot. If exactly two dots have an odd number of lines, you must start on one of them and finish on the other.
• If every dot has an even number of lines, you can start anywhere and you'll end where you began.
• Leave single bridges between two parts of the figure until last.

One-Line Drawing FAQ

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