Chaos: Hell's Gate (ドクター・カオス 地獄の扉, Dokutā Kaosu: Jigoku no Tobira) in Japan, is an action-adventure game originally released in Japan for the Family Computer Disk System in 1987 by Pony Inc. An English localization was produced for the Nintendo Entertainment System that was released in North America by FCI in 1988.

[1] The story revolves around Dr. Ginn Chaos, a mad scientist who has retreated from society in order to conduct secret experiments in his extensive mansion.

To make matters worse, the mansion's architecture is damaged and overrun with strange, hostile creatures.

[1] The player of this 2D side-scrolling adventure assumes the role of Michael Chaos, who is armed with only a Knife in the beginning.

At the end of each of the first 10 Warp Zones, Michael must fight a large monster that carries a piece of the Laser and guards a valuable piece of equipment, the latter consisting of the Ultra Space Sensor, four Life Bottles, the Air Helmet, the Jump Boots, two Blue Vitamins and the Shield Suit.