Kerbal Space Program

Build, launch, and pilot rockets in space simulator Kerbal Space Program, the physics-based sandbox where your designs must obey the laws of orbital mechanics—or fail spectacularly.

Start in your hangar and assemble your first rocket from available parts. The journey to your first liftoff is quick, but reaching orbit, landing on distant worlds, and safely returning your crew demands mastery of real aerospace principles. Every decision matters: fuel ratios, stage separation timing, trajectory planning, and landing procedures all determine success or failure. Press the space bar and watch your creation soar—or watch it tumble back to Kerbin in a blaze of glory.

Two distinct modes let you play your way. In sandbox mode, imagination is your only limit. Experiment freely with rocket design and space exploration without financial constraints or research timelines. Test wild concepts, push the boundaries of physics, and learn through trial and error—often very public, very entertaining error. Your rockets will obey real orbital mechanics, making even simple designs surprisingly challenging to master.

Career mode brings structure and stakes. Manage a tight budget while progressing through increasingly demanding missions. Research new technologies at your Space Center, train astronauts, and learn from both triumphs and failures. Every launch counts; every crash teaches something valuable. The pressure builds as you work toward your ultimate goal: sending a crew to the moon and bringing them home safely.

Don't let the cute appearance of the Kerbals fool you. This is a serious spaceflight simulator with genuine difficulty. Achieving escape velocity feels attainable; maintaining a stable orbit is a quantum leap harder. Landing on a planet, managing fuel, and returning safely? That's the real challenge. Hours of dedicated practice, problem-solving, and persistence separate dreamers from successful mission commanders. But for those willing to invest the effort, the reward is genuine mastery and unforgettable moments of triumph.

If you hit a wall, help is abundant. An official wiki packed with tutorials, guides, and theory awaits you. The community surrounding Kerbal Space Program is welcoming, active, and genuinely invested in helping new players succeed. Share your failures, celebrate your breakthroughs, and learn from thousands of fellow space program directors.

Whether you're chasing sandbox creativity or career-mode progression, Kerbal Space Program offers depth, challenge, and the pure satisfaction of defying gravity through knowledge and determination.