Oneline Game

One Line is a physics puzzle where the only tool you get is a single line, drawn wherever you want on the screen, to protect a small, unsuspecting man from whatever the level throws at him next — a boulder rolling downhill, a burst of rain, an angry swarm of bees, even gunfire. You sketch the line before the danger arrives, then watch physics decide whether your shape actually holds.

Getting it right is rarely about drawing something elaborate. A stray guess usually tips over or slides away the moment gravity kicks in, so most of a level is spent nudging the angle, length, and anchor point of your line until it braces properly and keeps the man untouched for three straight seconds.

Controls

Click and hold the left mouse button, drag to draw your line, then release. On mobile and tablet, drag a finger across the screen to do the same.

Tips

• Anchor your line against a wall, floor, or platform — an unattached line usually tips or slides away instead of holding still.
• Watch the angle, not just the position: a lopsided shape shifts under gravity before the threat even lands.
• If danger can come from more than one direction, a curved or boxed-in line covers more angles than a single straight stroke.
• There's rarely only one correct answer — if a shape keeps failing, try building lower and wider instead of repeating the same tall, narrow line.

It suits short sessions: most levels take just a few tries to read the threat and settle on a line that survives it.