Looking Glass Studios released the sequel to Thief in 2000. Utilizing the same Dark engine that powered the original Thief, Thief II had an almost identical look and feel, with only minor graphical and programming improvements, such as colored lighting. The basic gameplay was also fundamentally similar to the original Thief, but many new elements had been added, including technological gadgets such as a remote eye camera. Other changes include an increase in the number of AI behaviors.
Responding to criticisms of the original Thief, in that more time was spent on combat than actually living up to the title of the game, the missions in Thief II were designed much more around typical thief-like behavior, and much of the game is spent robbing the rich denizens of the City rather than battling monsters.