Oneline Game

Oneline is a physics puzzle game from Playable Factory built around a single tool: you draw one line per level, and that line is the only thing standing between a little character and whatever's about to fall, roll, or fly at them. Boulders drop, rain pours, bees swarm, bullets fly — your line has to block, redirect, or cradle the character away from it.

You only need to keep the character safe for a few seconds to clear a level, but getting there takes real thought about angles and gravity: a line propped the wrong way lets a boulder roll straight through, while a well-placed ramp or roof solves the same threat cleanly. Most levels have more than one working solution, and later ones stack multiple hazards at once, so the puzzle gets harder to read even though the tool never changes.

Controls

Drag the left mouse button to draw your line. There's also an eraser to undo a bad line and redraw it before committing to your solution.

Tips

• Think about gravity before you draw — a flat line stops a falling object, but a sloped one redirects it, which is often the safer choice when several hazards are converging.
• Don't be afraid to erase and retry; a level usually has more than one line shape that works, so if your first idea isn't quite landing, a small angle change can fix it.
• Watch how each new hazard type moves (falling, rolling, flying) before committing your line — the right shape depends on the hazard, not just its position.

It suits anyone who likes short, physics-based puzzles they can chip away at level by level, one quick line at a time.