Single Bomb Fast is a Halo 2 multiplayer game type, practically the same as Single Bomb, except the teams take turns defending the bomb and attacking with bombs. Bombing ends the round; also, the round ends in two (unlike three in Single Bomb, which is the only difference) minutes if the offense is unsuccessful in arming.
Rapid Assault is the 4 versus 4 small map version of Single Bomb Assault. Aside from the rounds being shorter and the decreased arming time all the variables are the same. This game is often played on Ivory Tower and Warlock.