One Stroke

How to Play

- Click or tap any node to set it as your starting point - Click a connected node to draw your line through the connecting edge - Each edge can only be used once — choose the order carefully - Complete every edge on the board to clear the level - HINT — preview the full solved path on top of the board - UNDO — step back one move - SKIP — jump to the next level - RESET — restart the current puzzle any time

Game Description

One Stroke is a minimalist line-tracing puzzle that turns a centuries-old math problem into pure, satisfying gameplay. Every level is a constellation of glowing nodes connected by softly-lit edges — your only job is to draw a single continuous line that visits every edge exactly once. No lifting your finger. No doubling back. Just one clean stroke. Tap any node to plant your starting point, then chain through its neighbours one edge at a time. Pick the wrong order and you'll paint yourself into a corner where no legal next move exists; pick the right order and the path glows into a complete trace. The puzzles are based on Eulerian paths from graph theory, which means every layout is mathematically guaranteed to have at least one solution — you just have to find it. The first ten levels are hand-crafted designs that introduce one wrinkle at a time: a triangle, a square with a diagonal, a star, an envelope, a dense interconnected web.