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If you play Halo 2 and want to compete in games of 4v4, 2v2, or even FFA then visit this website!http://halobattles.wikispaces.com/
~B.B RIP, 1982-2010Since organized communities are usually more enjoyable, you should take your time to read the forum rules to save yourself some trouble and help keep the forums clean :-)
This would be the thread to read over or post in if you're looking to gather other players for some Halo 2 matches. There are still plenty of Halo 2 players out there, so give that thread a shot :-)