I love Grifball and was wondering if there were any other such games available for play in Halo 4. I remember in a previous Halo game there was a game called "Sumo" where there were 4 teams of 2 and each team had a warthog. The objective was to ramp-up to the central platform and knock the other teams off. Grifball is the only game like this I see in Halo 4. I just want to make sure I'm not missing anything (are there user-created games like this out there)?