[[caption-width-right:256:"Chicken! Fight like a robot!"]]

->''Intruder alert! Intruder alert!''

A forgotten classic of UsefulNotes/TheGoldenAgeOfVideoGames. The player controls a humanoid, who must shoot robots and/or escape the room.

''Berzerk'' (Creator/SternElectronics, 1980) was one of the first video games to have voice synthesis, which it put to good use. It compels passersby to play by saying, "Coin detected in pocket"; spurs its computerized cohorts to victory with, "Stop the humanoid. Stop the intruder"; expresses its consternation with the player's success by saying, "The humanoid must not escape", and, most famously, insults fleeing players with, "Chicken. Fight like a robot."

Also noteworthy for being one of the first video games that afforded the player non-linear ways of achieving goals. The AI robots could be goaded into shooting each other, walking into deadly walls or otherwise killing themselves without the player firing a shot.

''Berzerk'' was even blamed for two deaths. Two teenagers in separate arcades had heart attacks after achieving high scores, causing MoralGuardians to wonder whether arcade video games were too much excitement for people to handle. Even in 1980, most people didn't take them seriously.

The game received a sequel, ''Frenzy'' (1982), which introduces two styles of robots (skeletons and tanks, who act the same, but the skeletons are slightly harder to hit from above or below), a temporarily-destroyable Evil Otto, destructible and reflective walls, and "Special" rooms with some feature that adds a twist to the normal game (the Robot Factory constantly sends out new robots, shooting the Power Plant immobilizes all robots in the room, shooting the Central Computer causes all robots in the room to go crazy and destroy each other, and Big Otto gets very very angry if you destroy Evil Otto in his chamber).

May have inspired ''VideoGame/CastleWolfenstein'' and its update, ''VideoGame/Wolfenstein3D'', or even ''VideoGame/Robotron2084''. Not to be confused with the 1967 British B-movie ''Film/{{Berserk}}'' or to the dark fantasy manga ''{{Manga/Berserk}}''.

!! Tropes detected in pocket!
* AmbiguousGender: The humanoid is always referred to by the robots as "it".
* AmbiguouslyHuman: The player is only called "the humanoid" in all official documentation, as well as by the robots.
* ArtificialStupidity:
** The player can use the other robots to kill each other and make Evil Otto smash the robots. They're slightly smarter in ''Frenzy'' (they won't walk into each other, for example), but not by much.
** In the UsefulNotes/{{Atari 2600}} version, the robots couldn't walk into each other (due to a one-robot-per-scanline technical limitation), but were much more likely to walk into walls.
* AttractMode: ''Coin detected in pocket!'' It was one of the first games in the market to be equipped with a speech synthesizer chip, and it isn't afraid to use the fact to attract players!
* BigMonsterCuteName: Evil Otto... though the big monster himself was cute too, being rendered as a smiley face. Originally, this was a temporary graphic until the programmer could think of something cool to use. The idea of players running away from something so cute and insipid was funny to the programmer. So Evil Otto stayed a happy face.
* BossWarningSiren: "Intruder alert! Intruder alert!" (or "Robot attack!")
* BreakingTheFourthWall: "Coin detected in pocket!"
* CheckPoint
* CollisionDamage: Touching another robot will kill you instantly. Robots [[ArtificialStupidity touching each other]] will also die instantly. Evil Otto will kill anything he touches.
* CrushKillDestroy: Destroying an Evil Otto in ''Frenzy'' will result in the robots shouting ''"Charge! Attack! Shoot! Kill! Destroy!"'' as the new Otto appears.
* DamageDiscrimination: Averted. Robots can accidentally kill each other by way of CollisionDamage, running into walls (usually by touching the end of one), and shooting each other. Evil Otto will kill anything he touches, even robots. In ''Frenzy'', you can [[HoistByHisOwnPetard hit yourself with your own reflected shots]].
* DeadlyWalls: The walls don't discriminate between player and robot; it is possible to get a robot to destroy itself by walking into a wall. Averted in ''Frenzy''.
* TheDreaded: Even the robots, who normally are after your blood, are afraid of Evil Otto, who is capable of killing them indiscriminately.
* EndlessGame
* EverythingIsTryingToKillYou. ''Everything''.
* FloatingLimbs: The humanoid's neck.
* HaveANiceDeath: "Got the humanoid! Got the intruder!"
* HitboxDissonance: See the humanoid in the picture at the top of this page? Well, its head and body have two separate hitboxes. A horizontal shot through [[FloatingLimbs that gap where the neck would be]], is entirely harmless. Call it an "Asimovian necktie".
* HoistByHisOwnPetard: You can kill yourself in ''Frenzy'' with your own shots if you aren't careful with the reflective walls.
* ImplacableMan: Evil Otto.
* InvincibleMinorMinion: Evil Otto cannot be destroyed, but his appearance forces the player to exit the room. In ''Frenzy'', Otto can be destroyed (it takes three hits); however, each such destruction will result in a new Otto spawning immediately thereafter, and moving faster than the previous one. (More than 3 Otto kills on one level can be said to constitute a CrowningMomentOfAwesome for the player who accomplishes that.)
** Optionally averted in the Atari 2600 version, one-third of the game variations have no Evil Otto, and one-third feature a killable Otto (he's worth no points, and he respawns after a few seconds). The remaining variations feature invincible Otto like his arcade counterpart.
* KillerRobot: Every enemy that isn't Evil Otto, though in Frenzy, some look like skeletons instead of robots.
* MoodDissonance: Evil Otto is out to murder you, and will happily destroy any robots that happen to be in his way. He's also a bouncing ''smiley face.''
* {{Mooks}}: The robots.
* MoralGuardians: (see above)
* NamesToRunAwayFromReallyFast: Evil Otto.
* NintendoHard: Most people can't last three rooms.
* NothingIsScarier: Much of the game's atmosphere is derived from this.
* OhCrap: "Intruder alert! Intruder alert!" (or, in the sequel, "Robot attack!")
** In ''Frenzy'', destroying Evil Otto in a Big Otto room is a bad idea, causing him to spawn four Evil Ottos and send them after you at top speed, in addition to the normal respawning one. "Oh crap" indeed.
* OneManArmy
* PerpetualSmiler: Evil Otto, though in the sequel ''Frenzy'' you can shoot him and his smile will turn into a neutral face, and then a frown.
* RandomlyGeneratedLevels: The stages are all randomly selected from pre-generated stages.
* RoboSpeak
* RobotWar
* ShootEmUp
* StalkedByTheBell: Evil Otto. This may be the TropeMaker.
* [[TakeThatAudience Take That, Player]]: Exit a screen before killing every robot and they chastise you for it. "Chicken! Fight like a robot!"
** Do it enough times in a row, and the robots start calling you "the chicken" instead of "the humanoid" in their background chatter.
* UndergroundMonkey: There is only one type of robot; as the game progresses, it changes color as it shoots more/faster shots. The second ROM version features more robot colors than the first.

[[folder: Got the humanoid! Got the intruder! ]]