Although the game is has long been available on a wide variety of mobile and desktop platforms, the Finnish game maker Rovio included features unique to the Facebook version, including power-ups intended to give users a leg up on the competition.
"There are four different types of power-ups and they can be accessed via the lightning bolt button at the top of the screen," the company said. "You can use two power-ups per level. All power-ups have a different effect but ultimately make you more competitive against your friends by making your birds stronger or more accurate or even by shaking the earth itself!"
The game is free to play on the social network at apps.facebook.com/angrybirds/, but the power-ups will cost players $1 for 20 uses.
