Grifball has been added as an official Halo 4 multiplayer mode.
The multiplayer variant was introduced by the fan community in Halo 3 and created using the Forge mode.
Grifball is essentially futuristic death rugby, in which two teams attempt to carry a round bomb into the enemy base. Grifball.hub has outlined changes to the mode introduced for Halo 4.
Microsoft has confirmed a Halo 4 release date of November 6.