Template:Infobox Zillion is a space adventure platform video game designed for the Sega Master System as a companion for the Zillion anime in 1987. The game is a free-scrolling platform/adventure in the vein of Metroid. It also has objects to be inspected and the necessity of enabling functions by accessing codes in the vein of Mission Impossible. A sequel to the game, Zillion II: The Triformation was also released.
Zillion is a game where you play the role of JJ. The mission is to retrieve the 5 floppy disks from the Norsa Forces base on Planet X, find his missing partners Apple and Champ, and destroy the Norsa base by entering a code in its mainframe. JJ is dropped off by the ship, and after he reaches the underground base at the initial part of the game, the rest of the game takes place indoors, underground. He does not emerge on top again until his mission is complete and the base is destroyed.
Some of the obstacles of the missions include tripwires, enemy guards, laser turrets and forcefields. The game style includes entering and exiting from room to room in the base, and unlocking each room with computer ID cards and inputting the correct code, pieces of which are found by investigating broken machines. Depending on the action, some ID cards will be reusable, while others will be eaten up by the machines. Aside from unlocking rooms, the player also has the option to make specific actions, such as turning off barriers, deactivating traps, or even committing suicide, among others. One of the codes is the one needed to self-destruct the Norsa base.
JJ carries a gun which was used as a design model for the Sega Master System Light Phaser. It is his main weapon in the game. As the game progresses, the gun will become stronger, allowing JJ to break capsules containing codes for the computers or powerups. Once rescued, additional characters can be used by the player, each one with its own differences; Apple is fast but weak, and Champ is slow but strong. Like JJ, they can also upgrade their gun power and get items for themselves.