add a mission builder.
Where you can build simple missions
1) Pick what planet to launch from
2) Pick what planet the player must get to
3) Pick what to do at that planet (orbit or land)
4) Choose how to rate performance (Time or Fuel usage)
And be allowed to write a briefing, as well as a message when achieving the target.
Andrew M commented
And share missions with others for them to execute and track high scores