AssassinBraun95

I am looking for a map variant along with the game variant i used to play on the classic Halo 3 but can't find anyone who has it on the MCC. It is the map on sandbox where the infected would spawn in the middle with a sniper and Rocket launcher and the others would hop on mongooses and go around the track and try to kill the one in the middle. it's either called Halo 2 on Halo 2 or Halo on Halo i have read that it was called different things. Thanks