The time for building is now and you have been chosen to get the ball to the goal. Create a vehicle that is sturdy enough, powerful enough, and versatile enough to cross gaps, climb rocks, climb nearly impassable walls just to get the ball in to the pink zone. Keep in mind that the physics are extremely accurate and not just anything will work. If it doesn't work, then go back to the toolbox, delete something, add something, and try try again. If you find something you like, then share it with friends and family in the brain-teasing feat of architecture.