I'm not sure how you beat 4-to-8-player Rocketball on Foundation in Halo 2.
Oddball, with a Rocketball variant (3 minues to win; no other weapons on map; toughness and speed with ball on; radar off but ball indicator on).
Crank up the surround sound, bump up the subwoofer, and laugh until someone pees.
We break for that.