"Jiasu Earth Liberation Army: ZAS") is a vertical scrolling shooter video game developed and published by T&E Soft for the Nintendo Game Boy exclusively in Japan on December 18, 1992.

Sometime in the 21st century, humanity leaves Earth for Mars due to a legacy of environmental pollution on their home planet.

An impromptu liberation army was set up to save the planet from the robots, who somehow got rid of the pollution on Earth.

[4] The parallax backgrounds and elaborate detailing in the sprites help to create a unique Game Boy experience; any distinctions between the scenery and the bad guys are clearly shown through different shades of the same color.

[6] Video gaming website Blame the Control Pad praises Chikyū Kaihō Gun ZAS for its innovative gameplay along with its integrated levels and player-friendly control scheme.