Collaboration is an important aspect of the architectis education. However, it is not amenable to the traditional project-based learning pedagogy that works so well for developing form-making skills. Being a process, rather than a product, it cannot be revealed by judging the results alone, which is often how form-making skills are taught and judged. Rather, the process of collaboration is only evident when the number of the participants exceeds a certain threshold, and when actions taken by other participants affect an individualis on-going design decisions. The advent of on-line, multi-player simulation games provides an analogy and an opportunity to explore interactive collaborative design pedagogies. Their abstract nature helps focus attention on the core issues of the simulated phenomenon, while the playful nature of a game, as opposed to “work,” encourages immersion and role playing that contribute to the learning process. This paper describes an on-line game for simulating the design collaboration process. It espouses to simulate, exercise, and provide a feel for the social dimension of collaboration, by embedding mutual dependencies that encourage players to engage each other ? in adversarial or collaborative manners ? to accomplish their goals. Specifically, it is intended to help students understand what collaboration is, why it is necessary, and how it is done. The game is modeled after popular board games like Scrabble and Monopoly: players build “housesi made of colored cubes on a site shared with other players. Actions taken by one player immediately affect his/her neighbors. A carefully constructed set of rules awards or deducts points for every action taken by a player and by his/her neighbors. The rules were constructed in such a manner that players who collaborate (in a variety of ways) stand to gain more points than those who do not. The player with the most points “wins.”