One Line Galaxy: a free one line draw puzzle you can play online
One Line Galaxy is a glowing one line draw puzzle with one simple rule: draw the whole shape in a single stroke. Start on any dot, drag along the lines and light up every one of them, without ever going over the same line twice. Play it free online in your browser with no download, on PC, laptop, tablet or mobile.
How to play the one line puzzle
- Press Play Game, then Play.
- Touch or click any dot to start your line.
- Drag to a connected dot. The line lights up in neon colours.
- Keep going until every line is lit, all in one continuous stroke.
- Finish without hints to earn three stars ★★★.
The first shapes take a few seconds. Then the dots multiply, lines start to cross and long diagonal links appear, and choosing the right starting dot becomes the whole puzzle. That mix of easy rules and real logic is what makes a one stroke puzzle so satisfying.
Rules of One Line Galaxy
| Rule | What it means |
|---|---|
| One stroke | Draw the shape as one continuous line, moving from dot to dot. |
| Every line once | Each line must be drawn exactly one time. A lit line cannot be used again. |
| Crossings are fine | Lines that cross without a dot are separate lines. You cannot turn where they cross. |
| Undo anytime | Drag back along your last line or press Undo to take it back. |
| No timer | Take as long as you like. There is no clock and no pressure. |
| Smart hints | Tap 💡 to see the next correct line. If your path can no longer be finished, the hint steps you back first. |
Unlimited levels, from easy to expert
One Line Galaxy has no level limit. The first levels are small shapes with four to seven lines, perfect for learning. As you climb, the board grows, the number of lines passes 30, lines cross each other and long diagonal links appear. Every level is built from a real one-stroke path, so every level can be solved. Your progress and stars are saved on your device, and you can replay any level from the level screen.
Tips to solve one line puzzles faster
- Count the lines at each dot. If a dot has an odd number of lines, the stroke has to start or end there.
- Two odd dots? Start on one of them and you will finish on the other.
- All dots even? You can start anywhere, and you will end where you began.
- Don't cut yourself off. Avoid using a line that is the only bridge to a part you have not drawn yet, unless it is your last choice.
- Drag back to undo. Slide back to the previous dot to take back a move instantly.
- Go for stars on replays. Once you know a shape, replay it to finish with no hints.
Controls
| Action | PC / laptop | Phone / tablet |
|---|---|---|
| Draw a line | Click a dot and drag the mouse | Touch a dot and drag |
| Undo | Z, U or drag back | Undo button or drag back |
| Hint | H or 💡 | 💡 button |
| Restart level | R or ↻ | ↻ button |
| Sound on / off | M or 🔊 | 🔊 button |
| Menu | Esc or ‹ | ‹ button |
| Fullscreen | Fullscreen button under the game | |
Why play One Line Galaxy on Online Games Galaxy?
- ✅ 100% free, no account
- ⚡ Play online instantly, no APK or download
- 💻 Works on PC, Mac and Chromebook
- 📱 Made for touch on phones and tablets
- ♾️ Unlimited levels, always solvable
- ✨ Neon visuals and relaxing sounds
- 💡 Smart hints when you get stuck
- 🧘 No timer, calm and relaxing
What is a one line puzzle?
One line puzzles, also called one stroke, one touch drawing or draw one line games, ask you to trace a figure without lifting your pen and without retracing any line. The idea goes back to the famous Seven Bridges of Königsberg problem solved by Leonhard Euler in 1736, which started the branch of maths called graph theory. Today they are loved as quick brain teasers: a level takes a minute, but finding the right start and the right order trains planning and spatial thinking. One Line Galaxy is our own take on the idea, with neon visuals, smooth animations and shapes that are always solvable.
One line draw puzzle FAQ
Is One Line Galaxy free to play?
Yes. One Line Galaxy is a completely free one line puzzle game. There is nothing to buy and no account is needed.
Can I play this one line draw puzzle online without downloading?
Yes. It runs right in your web browser on PC, laptop, Chromebook, tablet or phone. There is no download, APK or install.
How do you play the one line puzzle?
Touch any dot and drag along the lines. Every line must be drawn exactly once, and you cannot draw the same line twice. Light up every line in one continuous stroke to finish the level.
Is every level solvable?
Yes. Every shape is built from a real one-stroke path, so there is always at least one way to draw it in a single line.
How many levels are there?
There is no level limit. Shapes start with 4 lines and keep growing, with more dots, crossing lines and longer diagonal links as you progress.
What if I get stuck?
Use Undo to step back, or tap Hint. The hint first takes you back to a point that can still be solved, then shows the next line to draw.
More free games
Love logic games? Try the number path puzzle and the arrow puzzle game, see all free puzzle games, or browse all free online games.