Planet Merger

Drop a planet. Watch it fall, collide, and merge into something bigger.

Planet Merger is a physics puzzle about building the solar system one collision at a time. When two identical planets touch, they merge into the next one up — Pluto becomes Mercury, Mercury becomes the Moon, and on it goes. The board fills faster than you expect, the physics never quite behaves, and one well-placed drop can set off a chain reaction that clears half the screen.

MERGE ALL THE WAY TO THE SUN
Eleven worlds to discover, from tiny Pluto to the Sun itself. Every collision is driven by real physics, so no two games ever stack up the same way. Cross the line at the top and it's over — so think about where each one lands.

LEARN SOMETHING REAL
Every planet you unlock opens a card of genuine astronomy: diameter, distance from the Sun, number of moons, day length, year length, surface temperature. Plus the details that stick with you — like the fact that it rains diamonds on Neptune.

220 PLANET PUZZLES
A separate quiz mode with 220 questions about the solar system, space exploration, and the science behind it all. Ten questions a round.

ONE TAP TO PLAY
Tap where you want the planet to fall. That's the entire control scheme. Easy to start in a spare minute, hard to stop when you're one merge away from a world you've never seen.

PLAY IN YOUR LANGUAGE
Fully translated into 9 languages, quiz questions included.

Free to play. An optional one-time purchase removes ads permanently.