just as the title states, corpses that explode. you can adjust the damage, up to the point where an explosion will kill pretty much any beefed up hp in range. you can adjust the time for instant upon death where they just explode as you kill them or infinite where a corpse will have to be shot at to be killed. making the game range from downright chain reaction frantic especially in tight spaces(damage max, explosion instant) to adding a strategic element to the maps (infinite stay corpse)
either way, i would love to see my enemies get blown up.