When playing someone on the pit your always getting killed and beaten by enimies that are camping in the upper room. This is a way to go up their yourself or kill other up their. First grab the brute shot off of sniper tower and walk right below the doorways to the upper room. Take a step back and get a running start at the wall and jump. I the air brute shot almost strait down 3 times and you will end up in the room.

first you will need to be on co-op and you must have sputnik skull

okay start off by u getting on to the roof tops and making your way to where the pelican comes and gets johnson.
do 'not' jump to the floor, instead make your way to the right side of the broken bridge

now get your partener to come to you if he has not come allready and use him as a step to
get on the building with the slanted roof and make you way to hotel zanzibar using the step technique(if your partener cant get up get him to kill himself).

This is a pretty tricky skull to explain but I'll try my best. Okay the fog skull is on the level [b]Floodgate[/b]. It takes away the whole radar so you don't know what's behind you. To me I think this is okay considering you can go on one path most of the game and not have anything pop up behind you. Anyways, onto finding the skull.

[b]Step 1[/b]
Take out a battle rifle/carbine (just a long range type weapon or something that isn't automatic).