This paper describes the implementation and evaluation of the second iteration of SMILE (Science and Math in an Immersive Learning Environment), an immersive learning game that employs a fantasy 3D virtual environment to engage deaf and hearing children in math and science-based educational tasks. In this second iteration we (1) combine strategies used in commercial computer games with lessons from educational research on learning and motivation in order to increase the effectiveness of the application and the fun of its use, and (2) assess usability and appeal through a user study. To our knowledge, SMILE is the first bilingual immersive VLE (Virtual Learning Environment) for deaf and hearing students combining key elements of successful computer games, emotionally appealing graphics, and realistic real-time 3D signing, with goal-oriented, standards-based learning activities that are grounded in research on effective pedagogy.