Thief is an action-RPG that puts the player in control of a thief who must steal valuable items from dangerous criminals. The thief must use their quick reflexes and agility to navigate through the dense cityscape, avoiding obstacles and enemies. The game features a variety of different environments and enemies, including a dark and dangerous alley, a high-security prison, and a luxurious palace. Thief also includes a variety of different gameplay mechanics, including side-quests, infiltration, and treasure hunting.