Popular Games

Single Stroke — draw the whole figure without lifting your finger

Single Stroke is a one-line drawing puzzle in LEVO's Popular Games category. Each level shows a figure made of dots joined by straight and curved lines; your task is to trace the entire figure in one continuous stroke without going over any line twice. It's the classic "draw this without lifting your pen" challenge — the same idea mathematicians know from the bridges of Königsberg — turned into a touch game. With 152 levels, the largest set in the Popular category, Single Stroke helps improve planning and problem solving.

Start training Questions & answers

CategoryPopular Games

Levels152 levels

TimedNo — untimed

ProgressionLevel-based

How to play

The figure appears as faint guide lines connecting dots. Put your finger (or cursor) down and trace: the line under your stroke lights up as you cover it, and your finger has to actually follow each line's shape — including the curves — for progress to count. Work through the whole figure edge by edge; you may pass through a dot as many times as you need, but each line can be drawn only once. Where you start matters: many figures only work from particular dots. If you trace into a dead end, the drawing flashes red, shakes, and clears for a fresh try. Undo removes your last line, Reset clears the drawing, and a Solution button plays back one valid trace if you're truly stuck.

What it helps improve

Planning — A successful stroke is chosen before the finger moves — start point, direction, and order — which improves organizing steps and anticipating outcomes.
Problem solving — Each figure asks the same question — is there a route, and where must it begin? — boosting analysis of challenges and finding solutions.

Levels & progression

152 levels, played in order, with the level rail on the pre-game screen — the deepest level set of the seven Popular games. Untimed, no lives; dead ends clear automatically for a free retry.

Questions & answers

What is a one-stroke puzzle?

A figure of connected lines that must be drawn in a single continuous stroke, covering every line exactly once, without lifting your finger. Single Stroke has 152 of them, from simple shapes to dense figures with curves.

What happens if I hit a dead end in Single Stroke?

The drawing flashes red and shakes, and a moment later your trace clears so you can start again — there is no penalty, no timer, and no lives to lose. You can also Undo one line or Reset manually.

Does the starting dot matter?

Often, yes. Many figures can only be completed from certain dots, and finding a workable starting point is half the puzzle. On some figures any starting point can work — even mid-line.