Halo 3 skull question? can't see the skulls?

[-THE-MAIN-PLAYER-]

When i try to get the skull IRON i go to the place where its soppose to be in campaign in the main menu but i cant get it because it aint there

 

[B Nels]

Are you playing on the right difficulty? I don't have Halo 3 but if you tried getting skulls in Halo 2 you had to have the difficulty set to a cerain level.

 

[streetcleaner]

wtf i dont even have halo 3

 

[Dawgpound7000]

Make sure you have it on normal, heroic, or legendary difficulty. Make sure you start at the beginning of the lvl also.

 

[superdupa]

streetcleaner, we dont need random things like that (not that it is my place to say anything but i just dont enjoy reading random comments such as that)