No ODST comes as its own disc and if you own odst you get a beta of Halo Reach in 2010
It is not on a disc! It is on the sheet that says Halo Reach, But you will need Xbox Live.
By getting halo 3 odst ( two discs ) first disc halo 3 odst campaign and 2nd disc halo 3 mythic comes with all the halo 3 maps.
Yes.
Yes, there will be Forge mode in Halo 3: ODST... but on the other hand there is two discs so there might not be in the halo ODST disc.:)
Yes
you need halo 3 ODST to access the halo reach multiplayer beta
it will be free with the odst disc
yes
Yes and no The achievements will be counted the same and so will the disks but if you have the ODST multiplayer disc (Halo 3 Mythic) and you join someone's campaighn on regular Halo 3 it won't work same thing if someone on HAlo 3 regular joins a map that comes with ODST for example SandBox.
If you are asking which one is better, I would say it strongly depends on what you like. If you like the campaign from previous Halo games, I would say Halo 3. Halo 3 ODST is very weird and different. It's still fun though. And there is multiplayer for ODST, it just comes on a different disc.
well at midnight they are realeseing it..all you have to do is put in halo odst's disc and it will give you a code or something..