“…Many serious game-based research protocols take place in formal settings, such as investigators' labs or classrooms (Barab & Dede, 2007;Barab, Gresalfi, & Ingram-Goble, 2010;Charsky & Ressler, 2011;Kafai, 2009;Kafai, Quintero, & Feldon, 2009;Klopfer, Sheldon, Perry, & Chen, 2012), or in structured, informal environments like museums and after-school programs (Miller, Chang, Wang, Beier, & Klisch, 2011;Squire, 2011;Squire, DeVane, & Durga, 2008). Overall, there is a lack of research that implements serious games in unstructured, informal learning environments where students have absolute choice on where and when to play (National Research Council, 2011).…”