AGI (Adventure Game Interpreter) was the first major interpreter used by Sierra. With the release of King's Quest 1 in the early 80's, it introduced the gaming world to the concept of a 3D graphical adventure game, where the player could move a character around the screen, behind, in front of and over objects. Other commands could be typed in, just like a text adventure. This concept, in various forms, has been used many many times since, by Sierra and other companies such as Lucas Arts. It has proved very successful and continues to be used today in games such as Larry 7.
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===Version 3.0 (22 May 1999)===