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. Otto can go through walls with impunity and hunts the player character. Otto is unusual, with regard to games of the period, in that he's indestructible.

The function of Evil Otto, represented by a bouncing smiley face, is to quicken the pace of the game. A player can be killed by being shot, by running into a robot or an exploding robot, getting electrocuted by the electrified walls of the maze itself, or by being touched by the player's nemesis, Evil Otto. Using a joystick and a firing button that activates a laser-style weapon, the player navigates a simple maze filled with many robots, who fire lasers back at the player character. Each player plays until they lose a life, allowing the other player to have a turn. In two-player games, the second player controls a purple stick man on the right of the screen. When the game begins, the player controls a green stick man on the left of the screen. The player's objective is to destroy robots and navigate a maze of randomly generated rooms.

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