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Intelligent game-based learning environments integrate commercial game technologies with AI methods from intelligent tutoring systems and intelligent narrative technologies. This article introduces the Crystal Island intelligent game-based learning environment, which has been under development in the authors' laboratory for the past seven years. After presenting Crystal Island, the principal technical problems of intelligent game-based learning environments are discussed: narrative-centered tutorial planning, student affect recognition, student knowledge modeling, and student goal recognition. Solutions to these problems are illustrated with research conducted with the Crystal Island learning environment., Recent years have seen a growing recognition of the transformative potential of game-based learning environments. The burgeoning field of game-based learning has made significant advances, including theoretical developments (Gee 2007), [...]