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BacToMars: A Collaborative Video Game for BioDesign

: We present BacToMars, a collaborative multiplayer educational video game that engages elementary school children in creative bio-design. We describe the design of the game, its learning goals, and findings from its preliminary evaluation when deployed in informal settings accompanied by a curricular intervention. Our findings shed light on how children play a collaborative multiplayer game while co-located, and on the potential of collaborative video games as a tool for teaching biological engineering to young children and for making a positive impact on their attitudes towards science.