Freeze is one of the six power ups that can be obtained through killing zombies. When obtained, all of the zombies on the map will be frozen and greatly weakened to a point where they can be killed off with a single hit. The zombies will thaw after about thirty seconds, but will retain their weakened state, taking on a bluish grey appearance due to the texture not reverting to normal. The Ice also shatters upon being damaged, leaving no corpse behind. The freeze icon, although appearing to be a simple sparkle, is actually the ice seen on the zombie. This is due to the glow around the power-up being relatively large compared to the power-up icon itself. If Freeze is obtained at the end of a round, it will freeze any spawning zombies for thirty seconds.