The only skulls on the Halo 3 Multiplayer Disc are the Mythic ones (Orbital, Heretic, Sandbox, Longshore, Assembly, and Citadel). These can only be obtained while you're in Forge mode. Here's a good video to obtain the Sandbox, Orbital, and Assembly Skulls: http://www.youtube.com/watch?v=BxhluulxbDQ And this site is a good site to obtain Longshore, Citadel, and Heretic Skulls: *NOTE* You must click on the hyperlink on this page to be diverted to the description on where the skull is http://www.halo3planet.com/2009/09/16/halo-3-mythic-skull-locations-all-skulls-found/ The rest of the skulls can be found in Halo 3 Campaign, which is not included in the Halo 3 Multiplayer disc (Obtaining all these, both Silver and gold skulls will unlock yabusa armor for you to use in multiplayer).
*NOTE* If you add me as a friend I have a map that will take you right to the Sandbox Skull in my fileshare, granted you have to go through my easy and cool obstacle course.
OR If you are referring to the Multiplayer disk that comes with ODST, the you can find those skulls with this video compilation I put together: youtube.com/view_play_list?p=C61E241A53A....
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