One Line Fill
PuzzleFree to playTrace every line of a shape in one continuous stroke. Start anywhere, never lift, never reuse a segment — clear it and a bigger web appears.
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How to Play
One Line Fill shows a web of dots joined by faint lines. Your job is to redraw every line in one unbroken stroke: tap any dot to set your starting point, then tap a neighbouring dot that is still joined by an unused line to extend the stroke. The line you draw turns solid, and the dot you are on lights up gold. You win the moment every faint line has been covered exactly once — lift off or backtrack over a line and the run is over. Start on Easy with five dots, move to Normal with seven, then Hard with nine, where the web has more crossings to plan around. A dashed arrow marks a safe opening move so you can read the shape before committing.
Controls
- Tap any dot to begin the stroke
- Tap a connected, unused-line neighbour to extend it
Tips & Tricks
- 1Every line must be used exactly once
- 2The dashed arrow shows a safe first move
- 3Plan an exit before painting yourself into a corner
- 4Start from a dot with only one line (a dead end) so you don't strand it for later
- 5On Hard, count the crossings first — a line that traps the rest of the web is the usual way a stroke breaks
Frequently Asked Questions
What ends the drawing?
Lifting off, or trying to reuse a line you have already drawn, ends the run. You must cover every line once.
Where do I start?
Any dot. Tap it to set the starting point, then keep extending along unused lines.
How do I win?
The shape is filled the instant every faint line has been traced exactly once in a single stroke.
What do the difficulties change?
Easy has five dots, Normal seven, and Hard nine, so the web grows denser and the crossings harder to route around.
Is every web solvable?
Yes — each web is built so a one-stroke solution exists; the challenge is finding the order before a line strands you.
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