Kerbal Space Program casts players as directors of a space program run by the Kerbals, an alien race whose ambitions reach across the Kerbol system. Its central design turns spacecraft construction into a hands-on experiment: combine parts with distinct functions, then fly the resulting craft under realistic aerodynamic and orbital physics. Success is not guaranteed by a blueprint, and keeping the crew alive is part of the challenge.
The work extends beyond launches. Players pilot ships through complex maneuvers, explore the terrain of moons and planets, and can send crew members outside their craft. Docking makes it possible to assemble space stations, larger ships, and surface bases, while satellites can scan for biomes and anomalies. Communications networks and research add further layers to the effort of extending the expedition’s reach.
Three modes shape how that systems-driven play is approached. Science Mode ties experiments to new technology; Career Mode adds oversight of construction, strategy, funding, and upgrades; Sandbox opens the full set of parts and technology for unrestricted building.