The producers of Inception used tactical viral marketing techniques to promote the film while maintaining a sense of mystery. This included an interactive website with a spinning top that slowed down daily, a prequel comic book, a Facebook page with games for fans to play, mobile apps that placed users in the film's action, and an offline scavenger hunt across multiple cities with premiere tickets as the prize. The continuity across these integrated marketing campaigns built excitement for the film both before and after its release. Inception was a box office success, grossing over $800 million worldwide.