The objective is to locate the Skull(s) on the map and to maintain possession of it for the longest period of time possible. The default settings allow the game to be a free for all with one Skull on the map, which you need to have possession of for two minutes in order to win. This game can be played as a Rumble Game or a Team Game where the highest score of the lone player (Free-For-All), or on a team's accumulative score, chooses the victor(s). Normally, a player who has the Oddball is the immediate target for the other players, which is what makes Oddball an extremely fast paced and fun game-type.
While a player has possession of the Oddball, they cannot wield their weapons or throw grenades. However, they can still melee opponents with the Skull, which normally inflicts massive damage. The settings for the game can also be altered to make it more interesting. For example, the player with the Oddball can go invisible or can be slowed down. The number of Oddballs on the map can also be changed.
The Oddball's appearance is nearly identical through the original trilogy; the ball is a plain human skull. They are also identical to the skulls found in campaign in Halo 2 and Halo 3. In Halo: Reach the Oddball is on fire much like the Headhunter skulls. If the skull is dropped in water the flames are extinguished, though it will relight when it is picked up again. In Halo 4 the Oddball is a crystal skull in a metal frame.
Halo 4 features the first noticeable gameplay changes since Oddball's inception in Combat Evolved. Players can now throw the Oddball using the grenade throw button (default left trigger). Catching or intercepting a thrown skull awards medals. The skulls are also more noticeably affected by physics, bouncing off the surfaces and getting knocked around by explosions and Gravity Hammer strikes.
- Get ready for a classic game of free for-all Oddball. Hold the ball for 2 minutes to win.
 Reverse Tag
- Main article: Reverse Tag
- The player that becomes "it" needs to score 2 minutes to win.
- The player that is "It" is invisible and must kill 10 other enemies to win.
- The player that is "The Juggernaut" deals extra damage and must kill 10 enemies to win.
- Main article: Accumulate
- Players need to score 5 minutes to win. Kills speed up the timer.
- This game of Oddball, with nothing but rocket launchers, is a real blast. Control the ball for a total of 1 minute to win.
- Tense rounds with swords and no motion tracker. Control the ball for 30 seconds to win a round. First to 3 wins, a very deadly game.
 Team Ball
- Main article: Team Ball
- Up to 8 teams can go head to head in this game of team oddball. First team with 2 minutes ball control wins.
 Low Ball
- Team Oddball with a twist. Everyone on your team must hold the ball for at least 30 seconds to win.
- An odd game of ball with random weapons. Earn 2 minutes control time to win.
- Main article: Ninjaball
- A Halo 3 variant that grants the Oddball Carrier with more speed and less gravity, but cannot take as much damage.
 3 Ball
- Team Oddball with 4 teams and 3 balls. Earn 2 minutes control time to win.
- Oddball is derived from Marathon's "Kill the Man With the Ball".
- In Halo 3 multiplayer, if you melee an enemy with the Oddball it is an instant kill, however, this can be tweaked via the game setting in all of the Halo games.
- Getting three Oddball kills on a Legendary Map in Halo 3 matchmaking unlocks the Alas, Poor Yorick achievement.
- Earning three Oddball kills on any map after having downloaded Halo: Reach's Noble Map Pack unlocks the Crackin' Skulls achievement.
- In Halo 3, if you go to the game settings in the Custom Games lobby, go to Oddball Settings and change the ball number to two, a little notice appears at the bottom saying, "Players fight over two objectives. Ha, thought I'd make a ball joke, didn't you?"
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