1. The document discusses using open-source game development as a teaching method for software engineering. It describes two university courses where students developed mini-campaigns for the open-source game Battle for Wesnoth in small teams. 2. Developing campaigns for the game required integrating artistic, narrative, and technical skills. This playful approach helped engage students from diverse backgrounds. 3. The results showed students grasped the "playful cleverness" of open-source development. The author proposes exploring this teaching method with other games and distributed environments.