Given the promising results of massively multiplayer online games (MMOGs) for educational purposes, this paper maps the essential concepts behind MMOGs, into the classroom context. Since the number of students in this context is not massive and play takes place within a single room rather than on the Internet, we have changed the terms "massively" and "online" to "classroom" and "presential" respectively, thus giving us the new designation "classroom multiplayer presential game" (CMPG). We present the development of a CMPG for teaching concepts of ecology as laid down in the teaching objectives defined for a 6th grade course by the Chilean school authorities. © 2009 IEEE.