Oneline — Play Free Online

Arcade & Skill

Play Oneline free in your browser on Doodle Jump. Trace complex geometric wireframes in a single continuous stroke and solve clever puzzles.

Oneline is a clean, minimalist puzzle game built around a simple mathematical challenge: trace every edge of a geometric shape in a single unbroken stroke. There are no timers pushing you to rush and no enemies to dodge, making it a thoughtful change of pace between fast arcade rounds on Doodle Jump.

Every level presents a wireframe figure consisting of dots connected by straight lines. Your goal is to start at a single point, drag your path across every line segment on the board, and complete the shape without lifting your cursor or retracing any line you have already drawn. While early stages take only seconds to solve, later layouts introduce intricate webs of intersecting lines that demand careful planning before making your first move.

How to play

On desktop computers, click and hold the left mouse button on your chosen starting node, then drag the line across adjacent points until the entire outline is filled. On mobile devices or tablets, simply touch a starting point and slide your finger across the screen to draw the route.

If you take a wrong turn and reach a dead end with uncolored lines remaining, releasing the stroke immediately resets the puzzle so you can try a fresh approach. There is no penalty for restarting, allowing you to experiment freely with different starting points and routes.

Tips for tricky puzzles

Count the line connections: Look at how many lines meet at each dot. In graph theory, nodes with an odd number of connections are the key. If a puzzle has two odd nodes, you must begin your stroke at one of them and end at the other.
Identify dead ends first: Line segments that branch out to an isolated corner must be entered and exited along the same path, or visited at the very beginning or very end of your run.
Map the full route before dragging: Tracing the path with your eyes before touching the screen prevents you from painting yourself into a corner on complex multi-loop stages.

Similar games on Doodle Jump

If you enjoy working through clever obstacles, explore other puzzle and reflex challenges on Doodle Jump. Fireboy and Watergirl delivers cooperative platforming puzzles where timing and team coordination are essential. For high-speed parkour movement, OvO game tests your momentum and precision jumps, while Helix Jump offers quick reflex drops down a twisting tower.

Oneline runs directly in your web browser with no setup or downloads required, making it easy to jump in for a quick brain teaser during a short break or settle in to solve dozens of stages in a row.

Questions about Oneline

What is the goal in Oneline?

The objective is to draw a continuous path that covers every line segment of a geometric figure without lifting your finger or retracing any line twice.

How do you control the line in Oneline?

On desktop, click and drag with your mouse across connected nodes. On mobile or touchscreen devices, touch a starting point and slide your finger along the path.

What should you do when you get stuck on a level?

Look for dots that connect to an odd number of lines. If a layout has odd connection points, starting your stroke on one of those points usually solves the puzzle.