The Sierra Creative Interpreter (SCI0) is an early game engine developed by Sierra On-Line, primarily used for their adventure games in the late 1980s and early 1990s. It powered iconic titles such as King's Quest III and Space Quest II. SCI0 allowed for more complex animations, sound effects, and graphical capabilities compared to its predecessor, AGI. It laid the groundwork for future iterations of the SCI engine, enabling richer storytelling and more interactive gameplay experiences that defined a generation of computer gaming.