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) the top 10 for paid iPhone/iPod apps, while its iPad-exclusive "Angry Birds HD" versions were the top-selling and top-downloaded iPad apps for the year. Mattel also made a few board games based on the app. These were called "Angry Birds: Knock on Wood, Angry Birds: On Thin Ice" and "Angry Birds: Mega Smash". In February 2010, "Angry Birds" was a nominee for the "Best Casual Game" award at the 6th annual International Mobile Gaming Awards in Barcelona, Spain. In September 2010, IGN named "Angry Birds" as the fourth best iPhone game of all time. In April 2011, "Angry Birds" won