Angry Birds (video game) crates and rocks are incorporated into the structures, and power-ups may be used to enhance the birds to attack hard-to-reach pigs. Also in the levels, players can unlock bonus levels by collecting golden eggs. There are several different types of birds used in the game, distinguished by their color and shape. In the earliest levels only the basic red bird is available. As the player advances through the game additional types of birds become available. Some birds are effective against particular materials, and some have special abilities that may be activated by the player while the bird is airborne. For
Angry Birds (video game) in revenue from the advertising that appears in the free Android version. According to Rovio, players logged more than 5 million hours of game time each day across all platforms, with the series having 200 million monthly active users, as of May 2012. In November 2010, Digital Trends stated that "with 36 million downloads, "Angry Birds" is one of the most mainstream games out right now". MSNBC's video game news blog has written that "[n]o other game app comes close" to having such a following. "The Christian Science Monitor" has remarked, ""Angry Birds" has been one of the great runaway