Go to Campaign in The main menu, then hit X when the screen loads. The gold skulls are achievement ones, the silver ones are just silver skulls.
yes, you can make custom skuls in at the very least firefight mode.
All you have to do to view (or record) your clips in Halo 3 is to go to Theater mode.
If someone is looking to view the Halo 3 trailer, they can go onto YouTube's website to look for it. This trailer may also be viewed on Halo's website, or other video viewing services.
You can't
it depends on what you like, Halo 3 is a first person shooter while Halo Wars is a Real Time Strategy (like Age of Empires or Warcarft) personally i think Halo 3 is better, the only reason i play Halo Wars is to see another view of the Halo universe.
I don't think so, no.
halo 3 obviously
Halo 3: ODST is the newest of the two, but not the newest Halo game.
The halo time line goes Halo Wars, Halo: Reach, Halo:CE (halo 1), Halo 2, Halo: ODST, Halo 3. Halo 3 and ODST are practically at the same time.
After Halo 3 there was halo wars, halo 3 ODST, and Halo reach. A new company (not Bungie) will be making a Halo 4 and rumor has it there will be a remake of Halo Combat Evolved.
Halo 3 ODST is not for PC but Halo 1 and maybe Halo 2-3 are
halo3 odst is an expansion of halo3 the only big difference is that you no longer play as a Spartan you play as an odst.