Yes, completely free. Hints and skips are free too.

Do I need to install anything?

No. It runs right in your browser, and you can add it to your home screen like an app (PWA).

What is one-stroke drawing?

Drawing every line exactly once without lifting your pen — the same as the Eulerian-path problem in mathematics.

Starline

Reconnect the scattered stars with a single stroke.

What is this game?

Starline is a one-stroke drawing puzzle where you connect scattered stars to complete constellations. Trace every line exactly once to finish the picture. It turns the mathematical Eulerian-path idea into a smooth, tactile game.

How to play

Press a star and start dragging.
Trace every line exactly once — no repeats.
Made a mistake? Without lifting, trace back along your line to erase it.

Play Now ★

Tips & tricks

Stuck? Valid starting stars gently glow.
The hint button reveals the next stroke — free.
Special rules appear as you progress: directed, double, ghost lines and portal stars.

Features

85-constellation campaign with story
Collect animal, food & object pictures
Endless, Time Attack, Challenge & Zen modes
7 languages · installable PWA · free

FAQ

Is it free?: Yes, completely free. Hints and skips are free too.
Do I need to install anything?: No. It runs right in your browser, and you can add it to your home screen like an app (PWA).
What is one-stroke drawing?: Drawing every line exactly once without lifting your pen — the same as the Eulerian-path problem in mathematics.

Tonight, connect the scattered stars.

Play Now ★