Mission HydroSci (MHS) teaches water systems and scientific argumentation towards meeting Next Generation Science Standards. MHS is a game-based 3D virtual environment for enacting transformational role-playing, wherein students must learn new knowledge and competencies in order to successfully complete the game missions. MHS was developed for middle school science as a replacement unit of about 6 to 8 hours and uses analytics and a teacher dashboard to help support teachers support their students. [This paper was published in: "CSCL 2019 Proceedings," p.1017-1020. ISLS.]