I was looking through the game and they have the Original Maps Like on the old game and on the pc they might be moddable if we have a classic halo modder here. Files a10.map and a30.map http://www.megaupload.com/?d=85OQ385G
all skulls are unlockable as a jtag/iso mod in the game and user.cfg files have a look prolly some other debug/dev stuff can be added to the files too
in game.cfg change unlockskulls from 0 to 1 in user.cfg change game options = skulls to true thats it (rename the attached file back to .rar) View attachment hce cfgs unmodded.rar.txt