Turn on your phone during The Angry Birds Movie credits for a surprise!

Rovio Entertainment, the creators of Angry Birds, is asking viewers to turn on their phones during screenings of The Angry Birds Movie.

In order to unlock the level, players have to open Angry Birds Action! in the theatre, ensure the microphone is active, and once the red badge appears in the end credits they will unlock the new level in their game.

The Angry Birds Movie slingshots into theatres tomorrow, May 20th.