Mars Colony: Challenger is a 3D first / third person game that offers you the challenge of setting up a remote base on the surface of Mars. At its core, the game was derived from a simulator where everything is interactively tied together.
Most popular community and official game content for the past week.  (?)
What does popular mean?
It means the content you're seeing has been rated up more than it has been rated down for the given time period.