Kerbal Space Program (usually called KSP) is a space flight simulation game in which the player runs the Kerbals program, a cartoony race of small green humanoids. Their alien program works from the Karbal space center on the planet Kerbin, sending equipment to a reduced analogue of the real solar system (albeit with significant differences). KSP offers various goals in the form of contracts, but the nature of the game in the «sandbox» allows players to set and achieve their own goals in various «cerbal» ways.