The game [Halo 3] is crucial to Microsoft's efforts to establish dominance in the $30 billion global video game industry that has been dominated by Sony the past few years. Microsoft also competes against Nintendo's Wii console, which has enjoyed stronger sales this year.

Successful innovation creates non-linear growth effects. Cool products lead to more device sales and service subscriptions, which in turn create a larger installed base that feeds demand for additional games and services.

The game is a control point of the first type ( Geoffrey More calls it "unmatchable differentiation").
Installed based is a CP of the second type ( often called "platform").

Domination, i.e. a company's ability to dictate the pace of innovation in the industry is a CP of the third type.