Two hidden skulls on halo 2 are the sputnik skull and the unknown skull. In the level quarantine zone on legendary at the very beginning of the level go ahead and skip the short film and turn left then you should see an elite, to the left of him there is a cave. Go through the cave and go past the ledge on your right but don't go around it, the next ledge will have a little side walk thing. Walk on the side walk until you see something floating if you see it then congrats you found the sputnik skull! The unknown skull is on the level armory on single player and yes its on legendary but don't worry there are no enemies for aether of these skulls. at the start of the level wait until Jonson says "would it help if I said please" before entering the elevator. then walk across to the other car thing and hold X and walk up against the glass "not door" you should pick up up the skull and then go ahead and aether quit the level or go on with the level. the skuls will deactivate if you turn of the system.
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