Halo 3 skulls!!!!?

[Jack M]

so i decided to cheat, and i looked up some cheats.l and for the first skull location, it says it is behind the building where johnson is being held captive, now i looked up the video guide on youtube, and i went exactly where it told me. but ITS not THERE? Advice?

 

[Steve]

Two things commonly make the skull disappear.

1) You must be playing on one of the 3 highest levels of difficulty (normal, heroic, or legendary). If you play on easy, the skulls are not achievable.

2) You must start from the beginning of the level. If you begin from one of the rally points in the middle of the mission, the skulls are not achievable.

Good luck!

 

[Robert]

uh are you on heroic? i think you gotta be on heroic level....