Sorry for asking such a noob question. The truth is...I am a Halo noob. I tried the Halo Wars demo and I really really liked it. Then most of my friends suggested I should get Halo 3. So I decided to buy that when I buy the Rock Band drum kit. But then I saw at a gaming site that this "Halo 3 ODST" will have all the map packs and I figured it would be a good thing to have since I am not planning to buy a lot of MS points. I know that this game is an "expansion game". Is it? A) something for Halo 3 (do I need to have Halo 3 to play this?) B) a new Halo 3 but with the said map packs C) a game different than Halo 3?