Angry Birds Transformers generated characters to assist in a level for a limited time. Coins may be collected either during runs, popping pigs and/or simply by waiting and collecting coins that generate over time from freed areas. Some levels or features can be only unlocked when the player has upgraded enough Transformers to level 15. The game is the fourth game in the franchise to be compatible with Angry Birds' Telepods, a toy line that is also used in other "Angry Birds" games such as: "Angry Birds Star Wars II", "Angry Birds Go", and "Angry Birds Stella". When using Telepods, it can summon
Angry Birds (video game) hits of 2010". In December 2010, in honor of the one-year anniversary of the release of "Angry Birds", Rovio Mobile announced that the game had been downloaded 50 million times, with more than 12 million on iOS devices and 10 million on Android. By January 2014, the "Angry Birds" series had reached 2 billion downloads, including "Angry Birds", "Angry Birds Seasons", "Angry Birds Rio", "Angry Birds Space", "Angry Birds Star Wars I & II" and "Angry Birds Go!" On Christmas Day 2011 alone, 6.5 million copies of the various "Angry Birds" games were downloaded across all supported platforms. In the