Whether you're preparing to drop right in or are wavering outside the enlistment office, this is your basic field guide to Halo 3: ODST.Jump to a specific answer by clicking on a question below, or view the entire FAQ after the break: Is ODST worth $60? What's in the box? What's it like not playing as Master Chief? What are the new weapons in ODST? Will you show me the Achievements list? How many missions are in Campaign? What are the collectible Audio Logs, and how many are there? Is co-op play supported in Campaign? What are the basic rules of Firefight? How many missions (or maps) are in Firefight? Can I customize my character in Firefight? How many skull modifiers are there, and what does each skull do in Firefight? Does Firefight support online matchmaking? Is there new Halo 3 multiplayer content? Do I need to keep downloaded Halo 3 maps on my hard drive? Where are the hidden skulls in the new Mythic maps? How do I unlock Recon armor for Halo 3 multiplayer? WARNING: FAQ contains spoilers pertaining to names and descriptive elements of Campaign and Firefight missions, Achievements, and certain hidden/unlockable content.