One Line
Trace the whole shape in a single stroke — no line twice.
How to play One Line
Start by clicking any dot, then click or drag to a connected dot to draw the line between them. Draw every line in the shape exactly once — you can pass through a dot as many times as you like, but no line may be traced twice. When every line is drawn, the level is solved and the next one loads. Use Reset to clear the level and try a different route, or Hint to reveal a good starting dot.
One Line leaderboard
Top scores — log in to compete.
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One Line — frequently asked questions
Does every puzzle have a solution?
Yes. Every level is built to be traceable in a single unbroken stroke (an Euler path), so there is always at least one valid route.
Can I go through the same dot twice?
Yes — you may revisit dots as often as needed. The only rule is that each line (edge) is drawn exactly once.
Where should I start?
On many shapes it matters: if the puzzle has two "odd" junctions you must begin at one of them. Tap Hint to highlight a safe starting dot.
More black & white games
In the mood for more? Try 2048, Memory Match, Lights Out, 15 Puzzle — or browse all puzzle games and the full games list on Inkplay.