Matchmaking is xbox live. You need an account on xbox live to use it. You can play many different styles of multiplayer games with people all over the world, like Social Slayer, Capture the flag, Infection, etc. And they match you up with people your level, that's why it's called matchmaking.
halo 3 odst, unlike halo 3, has no matchmaking, sorry
To play on Halo 3 matchmaking you must have a gold xbox live membership and an internet connection to play on matchmaking. If you only have a silver membership it will not let you play matchmaking.
No not unless you were banned from Xbox live all together.
Matchmaking
keep doin matchmaking.
Shoot and kill people.
play in matchmaking
Yes. Halo 3 and Halo: Reach both have Matchmaking.
on the halo 3 main menu go on matchmaking pick a gametype and select start match making
no it will not it will have firefight like a halo version of gears of war 2 horde mode
there are lots like getting skulls matchmaking (online) and yea??
Yes, but you will not be able to use matchmaking.