MonkeyBridge is a collaborative Augmented Reality (AR) game employing autonomous animated agents embodied by lifelike, animated virtual characters and “smart” physical objects. The game serves as a pilot application to examine how “smart” software and hardware components capable of observing and reacting to events in the physical and virtual world can be useful in AR applications. We describe the implementation details of our test setups as well as how autonomous agents offer a rich gaming experience in AR games. Categories and Subject Descriptors H.5.1 [Information Interfaces and Presentation]: Multimedia Information Systems - Animations, Artificial, Augmented, and Virtual Realities. I.2.11 [Artificial Intelligence]: Distributed Artificial Intelligence – Intelligent Agents. General Terms Design, Experimentation, Human Factors Keywords Augmented Reality, Autonomous Agents, Multiplayer Games