More than 1.7 billion people around the world have downloaded the mobile games. Millions have bought the fluffy toys and the T-shirts. Some have even watched an "in-app" TV cartoon episode, launched this year, or even visited one of the branded theme park sites.
Finnish firm Rovio's madcap idea of creating Angry Birds, a game that originally involved firing birds through the air to smash pigs, has become a global phenomenon. And the spin-offs don't stop.
Coming soon is a full-length Angry Birds movie after Rovio announced it had recruited two Hollywood veterans behind Disney's Wreck-It Ralph and Sony's Cloudy With a Chance of Meatballs to direct the animated 3D film.
No wonder many regard Angry Birds as mobile's killer app. Its "freemium" business model means the games are free and only a minority of users pay for premium services and in-app extras in the digital world.
But such is the brand's scale and reach that fans who might pay nothing digitally have been clamouring to buy tangible, physical products, which are almost entirely paid for and generate valuable revenue.