Despite the fact that there isn't a 'HaloBall' gametype, I felt the desire to bring back the hockey variant.
It uses a tweaked version of Strongholds to score points. Rounds, in this case. You win the match by scoring 3 goals.
If you want more information on how I set up this system, feel free to ask.
What is HaloBall/Hockey ?
HaloBall originated in Halo Reach and quickly developed various variants, such as; Hockey, Avalanche, Pinball and many more. Later, some of them became part of Action Sack.
http://halo.wikia.com/wiki/HaloBall