Things You'll Need
Instructions
Finding Players On Xbox Live
Sign on to your Xbox Live Gold account, and insert your copy of Halo 3 into your Xbox 360.
Select the Matchmaking option on the start menu.
Select the Network option at the Matchmaking Lobby.
Highlight the Xbox Live option, and choose the Open Party setting.
Click the Playlist option at the Matchmaking Lobby, and choose a Ranked or Social online multiplayer match type.
Select the Start Matchmaking option. Your online match will load, where you can play with and/or against other Halo 3 players. Plug in your Xbox 360 headset into your Xbox 360 controller, and talk to other Halo 3 players.
Finding Players on Bungie.net
Go online to Bungie.net (see Resources).
Scroll your mouse cursor over the Account option, and click on "Create Account."
Use your email address to create a Bungie.net account.
Move your cursor over the Community option, and click "Halo 3" under the Game Forums.
Click on one of the existing forum threads, or create your own to chat with other Halo 3 players.