Destination: Mars!

As an astronaut, you go on space missions, eventually leading up to being the first man or woman on Mars. The missions consist of 3 or 4 major parts. Early on in the game, they include takeoff, an EVA to build the spacestation, pick up and deployment of cargo, a few science experiments, and reentry. These are the Low Orbit missions. Later, the missions include Space Station missions and Mars missions.