Galaxy Merge: Space Sandbox

Galaxy Merge is a relaxing, hands-on gravity sandbox — a pocket planetarium where you build the cosmos with your fingertips.

Drag glowing planets, stars, and comets onto the night sky, fling them together, and watch real-feeling gravity take over. When two worlds collide they merge and climb the cosmic mass ladder: asteroids and comets build planets, planets grow into stars, stars swell into blue giants, and enough mass collapses into a neutron star — or a black hole that devours everything around it.

There's no timer, no score, and no way to lose. Just a calm, endlessly playable universe to experiment with.

CREATE A UNIVERSE • Drag and fling planets, dwarf stars, giants, comets, and more • Watch bodies orbit, collide, and merge in real time • Grow your creations all the way up to a supermassive black hole

REAL-FEELING PHYSICS • Multitouch gravity — every object pulls on every other • Stars are born, burn, and die: supernovae, neutron stars, white dwarfs • Planets warm and cool by starlight; comets deliver water to seed life

COSMIC SPECTACLE • Light-bending black holes • Supernova explosions, shockwaves, and glowing nebulae • Lock any object in place and orbit others around it

BEAUTIFUL & LIGHTWEIGHT • Every planet, star, and effect is drawn procedurally — crisp on any screen • Tiny download, works offline, no account or sign-up

Galaxy Merge is free to play. A couple of the most extreme objects — like the Neutron Star and White Hole — can be unlocked by watching an optional rewarded ad; everything else is yours from the start.

Inspired by the touch-table exhibits at science museums and planetariums. Whether you're a space lover, a curious kid, or just want to unwind, there's a whole galaxy waiting at your fingertips.

Pull a planet out of the dock and start merging.