While militaristic, this might be interesting as a basis for projects in a course on multiagent systems or Java.

“Robocraft, developed for MIT’s 6.370 class, is a real-time strategy game. Two teams of robots roam the screen collecting resources and attacking each other with different kinds of weapons. However, in Robocraft each robot functions autonomously; under the hood it runs a Java virtual machine loaded up with its team’s player program. Robots in the game communicate by radio and must work together to accomplish their goals. The software and competition specifications are available for download.”

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