Halo 3 allows for 2-player co-op on one console, or 4-player competitive (Slayer, CTF, etc). Utilizing LAN features (connecting 2 Xbox 360s together using a cross-over LAN cable or connecting 2 or more Xbox 360s to a switch or router), Halo 3 allows for 4-player co-op (up to 2 players per Xbox 360) or 16-player competitive.
no you cant
Yes if you have a friend or family member willing to play with you yes but it has to be on the 360 itself you can't connect to your friends xbox offline
yes
You can play Halo 4 multiplayer offline in split-screen with up to four people on one Xbox. You need will need four controllers, and to do it, you need to go to "Infinity" from the main menu, then choose "War Games," then choose "Custom Game." To do this, all players will need to sign in to a profile or use a temporary profile (an actual profile is recommended, as your progress isn't saved with a temporary profile)
No, they are two completely different multiplayer setups.
There is multiplayer in halo 4
No, Halo 5: Guardians does not support system link play. The game is primarily designed for online multiplayer and does not feature a local multiplayer mode that allows players to connect multiple consoles via a system link. Players can enjoy split-screen multiplayer on a single console, but system link functionality is not available.
You can get 43 achievements offline on halo 3 im not sure on odst.
No, halo 3 forge is not offline, you may play it online with friends or others.
You get the Halo 3 ODST campaign and Halo 3 multiplayer. Nothing else.
you can get all of the skulls on multiplayer. =)
offline firefight coop surpports online 16 players, system link 16, and 4player split screen.