Do I need to install anything?

No. One Stroke runs entirely in your browser on phone, tablet or desktop, with no download and no sign-up.

Is every level actually solvable?

Yes. Each of the 200 shapes is built around a valid single-stroke path, so there is always at least one route that covers every line exactly once.

Tap the eye button to preview the solution, or the reset arrow to clear your line and try a different opening dot. Neither costs you anything, and you can replay a level as often as you like.

Can I jump to a particular level?

Yes. The menu button in the top-left corner opens the level picker.

Does it work with a mouse as well as a finger?

Yes. Drag from dot to dot either way; the line follows your pointer and snaps to the next dot when you release.

Tap a dot, then drag through every line — without lifting or repeating.

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One Stroke — One-Line Drawing Puzzle

Trace every line of the shape in one unbroken stroke, without lifting or repeating. 200 free levels, no download and no sign-up.

How to play, tips & FAQ

About One Stroke

Draw each shape in one unbroken line across 200 free levels. Start on a dot, cover every line without lifting or repeating. Free one-stroke puzzle. It covers Level Complete! and Choose Level. Everything runs inside the page, so there is nothing to install and no account to create. Open it, use it, close the tab — nothing is kept on a server and nothing is emailed to you.

How it works

One Stroke is built as a single web page. The whole thing is HTML, CSS and JavaScript delivered on first load, which is why it starts instantly and keeps working even on a slow connection. Your input is processed in the browser on your own device rather than being uploaded and handed back, so there is no queue to wait in and no upload limit to hit.

Works on phones as well as desktops

The canvas is measured against the height of the window it opens in, so a whole shape fits on a narrow phone screen and the same shape is drawn at a larger scale on a bigger display. Wherever it runs, the level menu sits at one end of the top bar and the eye and reset icons at the other, and a stroke is dragged from dot to dot with a fingertip, a mouse or a trackpad.

Common questions

Is it free? Yes. One Stroke is free to use and is paid for by the banner ads on the page — there are no pop-ups, no interstitials and no paid tier holding features back.

Do I have to register first? No — nothing to sign into, nothing to verify and no password to remember. The first shape is on the board as soon as the page opens, and nothing is asked of you before you can start drawing on it.

Will this run on my phone? Yes — tracing a shape with a fingertip is the way it was built to be played, and it runs the same in Safari, Samsung Internet, Firefox, Edge or Chrome.

Is there an app to get first? No. One Stroke is a web page, so whatever browser opened this page can already run it. Nothing to fetch from a store, nothing to bolt on.