Lego Robotics

Today, Le'Jayah and I learned about rover's and communication. It was fun to experiment with the rover and make it do tricks and such. First, we tried to make it go through the "gates" it worked and was pretty cool. Then, we experimented and tried to make the rover make a square, it was unsuccessful. Some struggels we encountered were when we tried to pick up rocks, and we couldn't figure out how to do that. Some questions I have are:
1. How do you make it move rocks?
2. What are some types of moves that can help on mars?