Mission: The Ark
Effect: Explosions are huge, sending aliens and objects soaring through the sky.
Instructions: After defeating the Scarab in the desert, grab a Gravity Lift from the building in the middle. Save it! Continue with the mission until you reach the second ramped stairwell and look up. You should see a stacked series of platforms, the very top of which holds the skull. A single Gravity Lift is usually not enough, so have a friend grab a second and deploy it on top of the first. It'll float in mid air, propelling you high enough to reach the skull. You can also place the second Lift on the edge of the middle platform.