Walk to the left side of the building with the fast ropes from the roof to see a large cork board. On this board you will notice a poster advertising Assassins Creed. Note: This advertisement on this poster changes with Xbox Live updates. Take cover with your back to the poster three times during terrorist hunt. Have a friend crouch in front of the left door to the teachers office up the stairs behind you and open it. Even though the doors do not actually open, you can still see through it as if it was. This lets you see if any terrorists are inside. This is very useful for breaching charges and C4, giving you very easy completion of this level. You can lurethe terrorists to this door once you get down to eight remaining.