South Park: The Stick of Truth -
No matter with whom you have sided, the pattern of this mission is roughly the same, the only difference being which groups are friendly or hostile. You launch an assault on the school so to reclaim the Stick of Truth, which is supposedly held in one of the desks. After the cut-scene you will learn that the main gate is closed, so look for the entrance at the side of the building. If you have sided with humans, you will find a wounded goth there. Use Butter's ability to heal him up and he will open the back entrance to the commons in return. If you are with elves, use Jimmy's ability to get inside through the accessible entrance.
When you get to the hall, you will have to go through several barricades. Shoot the pipe and then the wires above it, to electrocute the first opponents. Further on, use the vent and the probe to get to the other side of the barricade.