The game is normally $0.99 for the iPhone and $2.99 on the iPad.
Angry Birds Rio brought more of the same bird-flinging action that we all are quite familiar with by now, but also threw a couple of new very welcome twists into the formula. First and foremost are the boss fights, which were a first for the Angry Birds series and have you squaring off against the main antagonists from the Rio movie. The game also utilized more advanced graphics and recently was updated with tons of new power-ups and support for the widescreen of the iPhone 5.
Angry Birds Rio is free for a limited time on the iPhone and iPad from the App Store. [Direct link: iPhone/iPad]