Researchers question how and what students learn from commercial digital games. Using a concurrent mixed-methods approach, this study examined 30 students' construction of knowledge and skills while playing a commercial off-the-shelf game for 7 weeks. Quantitative data included students' background survey and pre- and post-assessments for knowledge and motivation. Qualitative data included students log sheets to document their progress of play through the game, videotaped interviews after each playing session as well as videotaped game sessions. Analysis indicates that two main play strategies were used during the process of learning--"explorers or goal seekers." Both player types were able to statistically significantly gain disciplinary knowledge and skills, but only "explorers" significantly valued the learning. (Contains 8 tables and 4 footnotes.)