? From a fizzy bottle in your backyard… to a nuclear-thermal giant aimed at the stars. Rocket Universe is an idle rocket-building sim where every launch is a test, every failure is data, and every new altitude unlocks the next chapter of your rocketry story. Start small — a simple air-pressure bottle rocket, a stopwatch, and a dream. Then upgrade your workshop, research better fuels, and climb the altitude charts one launch at a time. ━━━━━━━━━━━━━━━ ✨ FEATURES ━━━━━━━━━━━━━━━ ? 25 UNIQUE ROCKET FRAMES From the humble backyard bottle to multi-stage Atlas- and Vostok-inspired giants. Each frame has its own fuel compatibility, silhouette, and flame effect. ⛽ 10 REAL FUEL TYPES Air pressure · black powder · sugar propellant · solid composite · hybrid · liquid kerosene · hydrolox · methalox · xenon electric · nuclear thermal. Every fuel looks and feels different at ignition. ? DEEP WORKSHOP BUILDER Mix and match engines, tanks, nose cones, fins, and payloads across m...