Īs 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. It has only one controller, but two-player games can be accomplished by alternating at the joystick. The game has 65,536 rooms (256×256 grid), but due to limitations of the random number generation there are fewer than 1,024 maze layouts (876 of which are unique). If all the robots in the current maze have been destroyed before the player escapes, the player gains ten points per robot. The player advances by escaping from the maze through an opening in the far wall. Evil Otto moves at 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. 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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