- last post: 01.01.0001 12:00 AM PDT
depends, if you never ever play campaign mode then no you wont need the Halo 3 disk once you have Halo 3:ODST. ODST comes with the ODST disc (the campaign) and a disc which contains Halo 3 multiplayer (including all Halo 3 maps, from original release and all the mapacks, + 3 new maps) if you only use the multiplayer part of Halo 3 and do not play campaign/ don't want any of the achievments you need campaign mode to get then you will no longer need the Halo 3 after getting Halo 3: ODST