This study is part of an ongoing design-based research project to investigate whether an OpenSim-based virtual-reality game can promote the learning of fractions and proportions for 5th graders. In this study, the game prototype was tested with pre-service teachers and math students to investigate its usability, playability, and learning integration. An adventure-themed storyline was created on a virtual world named as the Island of Pi, and the game-based intervention was carefully designed into three learning-by-making tasks with increasing difficulties. Data were collected via video recording, infield observation, experience survey, and interview. Findings of this study should inform designers and researchers on the design of game tasks and mechanics that reinforce content learning.
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