Online when you play Halo 3, you can play ranked, social, or double exp weekend stuff. Ranked games consist of Lone Wolves, Team Doubles, Team Slayer, Throwback, Team Snipers, Team Swat, and MLG. There use to be a ranked playlist called Team Objective, but Bungie, the company of Halo, took it out and then gave it back, but they have renamed it. I have heard that Bungie is taking Throwback out because not that many people play it. MLG use to have many more maps to play on, but Bungie has also changed that. There are only 4 common maps I know of that you will get in MLG. Team Swat and Team Snipers were originally double exp weekend stuff, but Bungie has made it into a ranked playlist for the players of Halo 3 to play.
Social match making consists of Rumble Pit, Social Slayer, Multi-team, Team Mythic, Big Team Battle (Big Team Social) and Action Sack. Social Slayer used to be 4 VS 4, but now it's 5 VS 5. I personality think Bungie should change it back. And then there's Rumble Pit. It used to be a free for all playlist with 6 people and Bungie have changed it to 8 players. I think they should also change that back. I don't see the point of Action Sack at all. You play it. You win and lose. It doesn't matter. You don't earn EXP at all. Bungie should take Action Sack out.
Double EXP weekend consists of many different kinds of playlists that a player could play to earn 2 EXP points each game if won or in a certain place, like the top 4 or 6. Bungie has this Double EXP weekend playlists starting in the Central Time Zone (-6) Thursday at 3 P.M. until Monday 3 A.M.
These ranks require no highest level. Just EXP.
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Recruit
Apprentice
Apprentice grade 2
Private
Private grade 2
Corporal
Corporal grade 2
Sergeant
Sergeant grade 2
Sergeant grade 3
Gunnery Sergeant
Gunnery Sergeant grade 2
Master Gunnery Sergeant
These ranks are given to anyone who has achieved level 10-19.
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Lieutenant
Lieutenant grade 2
Lieutenant grade 3
First Lieutenant
These ranks are given to anyone who has achieved level 20-29.
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Captain
Captain grade 2
Captain grade 3
Staff Captain
These ranks are given to anyone who has achieved level 30-34.
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Major
Major grade 2
Major grade 3
Field Major
These ranks are given to anyone who has achieved level 35-39.
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Commander
Commander grade 2
Commander grade 3
Strike Commander
These ranks are given to anyone who has achieved level 40-44.
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Colonel
Colonel grade 2
Colonel grade 3
Force Colonel
These ranks are given to anyone who has achieved level 45-49.
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Brigadier
Brigadier grade 2
Brigadier grade 3
Brigadier General
These ranks are only given to people who have gotten a level 50.
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General
General grade 2
General grade 3
Five Star General
When you win a game, you get
+1 experience points
When you lose a game, you get
+0 experience points
When you quit a game, you lose
-1 experience points