We learn most effectively in a state of play. Although I wouldn't consider Evoke a game, it is a slightly more playful environment than I usually see when it comes to learning. The concepts of "quests" and "powers" are very intriguing. I'm starting to see how playful concepts of learning can be built into classrooms or learning environments.
So here is a question for you: Would a third grader be more interested in doing math for a grade from an authority figure, or would she rather gain "logic power points" based on peer feedback? The second option would require more collaborative work, but do you think it could work?