This contribution aims at highlighting how a video-game firm copes in managing creativity and expression of artistic values, while meeting the constraints of the economics of mass entertainment. The research is based on an ethnographic study in one of the largest video game studios in the world located in Montréal. The approach considers that the creative units of the firms are the "communities of specialists" (game developers, software programmers, etc…). Each of these communities, which has found in Montreal a fertile soil that nurtures their creative potential, is focused on both exploration and exploitation of a given domain of knowledge. In order to valorize these sources of creativity, the integration forces implemented by the managers of the firm in order to bind the creative units together for achieving commercial successes reveal a hybrid form of project management which combines decentralized modular platforms, with strict constraints on time, and a specific management of space that favours informal interactions. However, we suggest that the integration forces put forwards by the firm are not just for harnessing creative units: they generate also "creative slacks" for further expansion of creativity.