click: burst • right-click: explosion • middle: comet • hold G: well • W: pin well • hold V: draw walls • H: HUD

Bouncy

running

0FPS

0particles

0births/s

–arena

Gravity 100% Particle elasticity 1.00 Wall elasticity 1.00 Time scale 1.00x Quantize off

Explosion threshold 30/s Ping volume 100%

Launch options

These are set at construction (like the native command line); applying restarts the simulation with a new URL.

Preset Particle size Initial speed Seed Min particles

Optimized for Chrome — frame rates in other browsers may be substantially lower.

Presets via URL, e.g. ?preset=accretion, ?preset=fireworks, ?preset=marimba, ?preset=orbits&seed=7. Any CLI option works as a query parameter.

Source · API docs · MIT license (third-party notices, font license) · runs entirely in your browser. Sound starts after the button above (browsers require a click).