I’m on Mission 7, I’ve got all skulls by myself thus far except for two. My boyfriend got those because he knew where they were and I didn’t.

I did notice that while trying to get the gold skull for the Ark, I started at the check point today after you kill everyone on the building structure of where it’s at.. It was still there, I didn’t have to redo the whole mission but of course, I think what they’re meaning is that if you’ve already completed the mission.

Check points only work if you’re not done with it, yet.

If anyone reads this and still needs the second gold skull - the easiest way to get it is to use the green gated thing and walk on it until you’re even with the beam, jump up on the beam and then jump on the pipe.

It would of taken me forever to do it the way the video I looked at done it. Shesh, that looked like torture.

http://www.joystiq.com/2007/09/26/where-to-find-all-9-gold-halo-3-skulls/

Video for all 9 skulls.