update would come in July, and the Angry Birds app icon would receive a new design. On July 3, 2013, the update was released, with fifteen levels of all-new game play. Instead of knocking over the pigs' castles, the player's goal is to keep the pigs from stealing the egg and leaving the playing field with it. The pigs arrive in waves of complicated vehicles, and the only available bird is Red, whose new ability is to target the nearest pig. There is no score, and the three stars are awarded by completing three objectives in one try. The first objective is to finish the level without getting the egg stolen. The second is to pop all the pigs in the level. The third is to use fewer than or equal to a certain number of birds to clear the level. Because some people were skeptical about the new gameplay, Rovio later announced that they would add levels to the episode based on the original level style. On September 16, 2013, Rovio added 15 levels to the episode using the original style and these levels include manual targeting for Red Bird. On November 26, 2013, Rovio added a 30-level episode called Short Fuse that transforms the Bomb's explosions into highly-destructive electrical pulses, adds a powerup that transforms any Bird into a Bomb Bird and 3 different potions that can change the pigs. On December 11, 2013, Rovio added 15 levels to episode Birdday Party (cake 4) to celebrate its fourth birthday. On March 4, 2014, 15 levels were added to Short Fuse and the power-up icons were updated. On July 22, 2014, a 15-level episode called "Flock Favorites" that is inspired by fans' favorite episodes (Poached Eggs, Danger Above, Mine and Dine, Bad Piggies, Red's Mighty Feathers, Short Fuse, and Surf and Turf) was added. On November 23, 2014, in partnership with (RED) and Apple Inc., an update to the app was released that was exclusive to iOS. In this update, there was an added special (RED)-themed Golden Egg level and Red's power from the Red's Mighty Feathers episode as a stand-alone power-up, that when purchased, can be used indefinitely (1 use per level) and 100% of the money went to the Global Fund to end AIDS. This purchase was only available until December 7, 2014. On December 11, 2014, in honor of the Angry Birds' 5th birthday, an episode