‘Grifball’ will be an official multiplayer mode in Halo 44 Sep 2012
Community-created future sport ‘Grifball’ will have its own official multiplayer mode in Halo 4, according to developer 343 Industries. The team-based sport will make the step up from its beginnings as a mod when the game is released worldwide on 6 November this year.
In Grifball, two teams compete over a grenade-like ball and have to carry said ball to their opponents goal. That is, without being intercepted by someone wielding either a massive hammer (which runs the risk of sending the ball flying, but has a lovely long reach) or a closer quarters energy sword.
Oh yes, and the ball sometimes explodes.
This old episode of Red vs Blue should make matters perfectly clear.