the game mode is called beserker and the map is called gears of war. i don't know how you would find it but i might put it in my file share sometime but the beserker goes in the chopper and tries to splatter all of the humans. each human has one life and they have to try to get to the end to get the custom powerup at the end that lets be able to take out the beserker with a spartat lazer that is also next to the powerup. charge up your shot and go BOOM! and thats that