Frenzy was released in May 1982.
Frenzy speaks to you as you play. It has a voice synthesizer that spouts little phrases. These were done in a monotone computer voice, which was difficult to understand when combined with other in-game sounds (The voices were actually done using LPC encoding, which cost $1000 per word back in 1980). These phrases were also translated into several European languages (Spanish, French, and German) for release in Europe.
In Frenzy, however, the robots are nowhere near as chatty. They only speak in a few specific situations. See "Differences from Berzerk" below for full details.
Mark Smith holds the official record for this game with 4804540 points.
DIFFERENCES FROM BERZERK...
* In "Berzerk
", the walls are all solid. In Frenzy, some of the walls of the maze are composed of 'dots' which can be shot. This opens up strategies such as blasting a hole in the side of a room to escape when in trouble. The solid walls, on the other hand, now reflect shots. You can trick robots into killing themselves by standing on the opposite side of a reflective wall and letting them shoot themselves. The only wall that simply absorbs shots harmlessly as in the original is the closed door that appears behind you when you enter a new room.
* Neither type of wall is electrified, and so you can touch them without dying. On the other hand, you also usually can't kill robots by tricking them into walking into the now-harmless walls. In addition, you can no longer die by touching the robots or their explosions. Only their shots can kill you (though the blast radius from an exploding robot can kill you). There are two types of robots: skeletons and tanks. The two types have identical AI, but the skeletons are more difficult to shoot from above or below (because they're so thin).
* In "Berzerk
", Evil Otto was unkillable and unstoppable. In Frenzy, where he's known as Crazy Otto, shooting him once changes him from a smiley face to a 'neutral' face, and another shot converts him to a 'frowny' face. Another shot kills him. However, killing Crazy Otto makes him a little bit faster the next time he appears, which is usually immediately.
* Every four mazes, there are seemingly decorative elements in Frenzy that don't exist in the earlier game. For example, in one room is a huge statue of Otto called Big Otto. Each one has a specific effect on game-play 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're in such a state, the walls can kill them. The Robot Factory will continue to spit out additional robots while you're in the stage, taunting you as it does so. Shooting the factory has no effect.
* In the Big Otto room, if you kill Crazy Otto, not only does he immediately respawn as usual, but Big Otto will spawn four more Crazy Ottos (as depicted in the cabinet's sideart image) and sends them at you; the spawned Crazy Ottos all move 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 his expression changes to one of rage, with glowing red eyes and a frowning mouth, when you kill Crazy Otto. He also smiles when you die, though his eyes remain the same as before, either closed or open.
* Finally, the robots are nowhere near as chatty. They only speak in a few specific situations. They say 'Robot, attack!' when Crazy Otto appears, 'Charge...attack...shoot...kill...destroy!' when you kill Crazy Otto and he respawns, 'The Humanoid must not destroy the robot!' when entering the Big Otto room, 'Where is the Humanoid?' when shooting the Central Computer, and randomly alternates between 'A robot must get the humanoid' and 'A robot is not a chicken' when the Robot Factory dispenses a new robot. The constant background chatter of the original game is gone.