1,700 million km2 -- Total solid surface area of the Solar system potentially (if remotely) suitable for human habitation[1] (http://uts.cc.utexas.edu/~gwk/images/SolSys/SolSys)
... the direction and speed of movement (it's a 3-speed stick). Gameplay is very challenging and rewarding, and once the player has gotten through a level there are ...