Space Adventure Zodiac is a text adventure with graphics, where the player navigates the protagonist and interacts with the environment by typing text commands. The space archaeologist Dr. Dumas disappeared under mysterious circumstances five years ago. A freight trafficker named Boy finds himself involved in this mystery and is determined to find him. Together with his robotic side-kick Amaroid Marie he travels to the dangerous planet Death Starslum, where giant reptiles and other intimidating creatures have become reality.