Let's compare ( Berzerk )

Description Source:

http://en.wikipedia.org/wiki/Berzerk

Berzerk is a multi-directional shooter video arcade game, released in 1980 by Stern Electronics of Chicago.

Gameplay

The player controls a green stick-figure, representing a "humanoid." Using a joystick (and a firing button to activate a laser-like weapon), the player navigates a simple maze filled with many robots, who fire lasers back at the player character. A player can be killed by being shot, by running into a robot or an exploding robot, coming into contact with the electrified walls of the maze itself, or by being touched by the player's nemesis, "Evil Otto."

The function of Evil Otto, represented by a bouncing smiley face, is to quicken the pace of the game. Otto is unusual with regard to games of the period, in that there is no way to kill him. Otto can go through walls with impunity, and is attracted to the player character. If robots remain in the maze Otto moves slowly, about half as fast as the humanoid, but he speeds up to match the humanoid's speed once all the robots are killed. Evil Otto moves exactly the same speed as the player going left and right but he can move faster than the player going up and down; thus, no matter how close Otto is, the player can escape as long as they can avoid moving straight up or down.

The player advances by escaping from the maze through an opening in the far wall. Each robot destroyed is worth 50 points. Ideally, all the robots in the current maze have been destroyed before the player escapes, thus gaining the player a per-maze bonus (ten points per robot). The game has 64,000 mazes, and each level is designed to be more difficult to finish than the last. It has only one controller, but two-player games can be accomplished by alternating at the joystick.

The game is most difficult when the player enters a new maze, as there is only a short interval between entering the maze and all the robots in range firing at the player. For the beginner, this often means several deaths in rapid succession, as each death means starting a new maze layout.

Another memorable feature is the action of the robots—unlike adversaries in most other contemporary games, Berzerk's robots are known for being noticeably "stupid," killing themselves by running into walls or each other, shooting each other, or colliding with Evil Otto.

Two different versions of the game were released. As a player's score increases, the colors of the enemy robots change, and the robots can have more bullets on the screen at the same time (once they reach the limit, they cannot fire again until one or more of their bullets detonates; the limit applies to the robots as a group, not as individuals). In the original version, the sequence goes: * Dark yellow robots that do not fire * Red robots that can fire 1 bullet * Dark cyan robots that can fire 2 bullets.