Gameplay was very complex for its time, featuring role-playing, stealth and hacking elements, similar to the later immersive sims System Shock and Deus Ex series of games.'s experiments has escaped and is wreaking havoc on London, which is where the player comes in, taking control of a national security spy (or a "cyber cop" in the North American Genesis version) working for the agency known as ZODIAC, assigned to infiltrate and expose the illegal activity.Game elements include hacking electronic door locks from terminals, avoiding alarm triggers and security cameras, battling enemies, and staying alive through the planned use of the items bought in advance before the mission.In order to reach lower floors, the player must locate special key cards or terminals to acquire higher security clearances to operate the elevators.The Amiga and Atari ST version also had customisable content: a suitable registration card with a request could be sent to Core containing details of the player and a passport-sized photograph attached.