So my i was jw about the 2nd disc which i heard is just for halo 3 multiplayer and you get all maps with it... so my question is if i buy the odst but only use disc 2 will the game "Halo 3: ODST" be in my played games list? beacause i only want to continue playing Halo 3 and scoring more achievements, i dont want to have 0/1000 Gamescore in ODST.. (lol im an achievement freak :D) so please help ty :))