face to a "neutral" face, and another shot converts him to a "frowny" face. Another shot kills him. However, each time Evil Otto is killed it makes him a little bit faster the next time he appears, which is usually immediately. Every four mazes features interactive, decorative elements that were not present in Berzerk. In one room is a huge statue of Evil Otto, for example. Each one has a specific effect on gameplay for that one room. The order is: Big Otto, Power Plant, Central Computer, and Robot Factory. The Power Plant and the Central Computer are surrounded by walls made entirely of "dots", while Big Otto and the Robot Factory are surrounded by reflective walls with only one breakable "dot" in the corner, making them more difficult to hit. In the Power Plant room, shooting the power plant once will disable it, and all robots in the room will stop moving. In the Central Computer room, shooting the computer will cause all the robots to start moving and firing erratically. While they are in such a state, the walls can kill them. The Robot Factory will continue to spit out additional robots while the player remains in the stage, taunting as it does so. Shooting the factory normally has no effect, although, in the Coleco port, shooting the factory will disable it and stop the endless stream of robots. In the Big Otto room, if the player kills Evil Otto, not only does he immediately respawn as usual, but the Big Otto sends four more Ottos onto the screen, all moving at top speed. Like the Robot Factory, shooting Big Otto has no effect. Big Otto starts out with closed eyes and a neutral expression, but kill all of the robots in the room, and his face turns into a slight frown (only in the Coleco port). When Evil Otto is killed, his expression changes to one of rage, with glowing red eyes and a frowning mouth. He also smiles when the player dies, though his eyes remain the same as before, either closed or open. Finally, the robots in Frenzy are less talkative than those in Berzerk, only speaking in a few specific situations. They say "Robot attack!" when Evil Otto appears, "Charge attack shoot kill destroy" when the player kills Otto, "The humanoid must not destroy the robot" when entering the Big Otto room, "The humanoid..."