Kerbal Space Program is… probably best described as a sandbox space program simulator. Except that doesn’t really tell you everything or even anything. Okay, so KSP is a game where you take control of the space program of an amusingly incompetent race called the Kerbals, build spacecraft of various types, try to get them into space and then try and do things with them. Things you can try to do include getting into a stable orbit of Kerbin (the Kerbals’ home planet), visiting the Mun (that’d be the moon), landing on the Mun, getting back to Kerbin and landing without exploding, crashing or crashing and then exploding. This is often rather hard because PHYSICS DAMN IT.