Click or hold the sky to add shells · adjust the barrage rate for a bigger finale
This 2D simulator recreates a fireworks grand finale over a night skyline: instead of one shell at a time, an auto-barrage continuously launches rockets — each a real projectile under gravity that climbs, decelerates and bursts near its own apex — so dozens of overlapping arcs and bloom, ring and willow bursts fill the sky together. Tune the barrage rate to build toward a crescendo, click or hold the sky to add manual shells on top of the automatic ones, lock the burst color or leave it random, and watch live readouts track rockets still climbing versus sparks already released as the display swells and fades.