Play Bump the Balls

Bump the Balls is a physics puzzle that hands you a single tool — a line you draw yourself — and a hundred levels that ask you to use it cleverly. Two balls sit apart on the screen, and your only goal is to get them to touch. Draw your line, let go, and gravity takes over straight away: whatever you sketched becomes a solid surface for the balls to roll down, bounce off, or slide along. The appeal is that nothing runs on rails. There is no single correct answer waiting to be uncovered, just a physical situation you have to reason your way through. Some levels really do come down to a short flat platform dropped in exactly the right spot. Others want a curved ramp that carries one ball around an obstacle, or a wall that holds the second ball back long enough for the first to arrive. Timing counts as much as shape, because both balls start moving the instant you release. Difficulty builds steadily rather than spiking. The opening levels teach you how the physics behave, then hazards and moving mechanisms appear, and the margin for error narrows until a line drawn slightly off sends a ball into a spike instead of safely past it. When a level genuinely stumps you a hint is available, so being stuck never turns into a dead end. Drawing is the entire control scheme: press on an empty area, drag to trace your line, and release to commit it. Bump the Balls is a free browser puzzle game with no download required, playable on desktop and mobile by clicking or tapping.