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 augmented reality "Briefcase Hunt" competition across several cities. The continuity across these integrated promotions built excitement for the film both before and after its release. Inception was a box office success, grossing over $800 million worldwide, and one of the highest-grossing films of all time.