24 new levels available after update to Angry Birds Rio1
originally launched back in March 2011 and received an update with 12 new levels almost a year later.The latest update for the game brings 24 new levels, but to obtain them, they must be earned by the player. You need to collect starts to earn 18 special star levels, and collect feathers to receive 6 Mighty Eagle levels.
The new update to Angry Birds Rio brings Super Scope laser targeting, which sounds bad for the pigs, and Super Seeds help super-size your birds. There are also some new power ups called Samba Burst and TNT Drop. The former lets you "dance your way to destruction," while the latter allows you to send a "special delivery". There are now 204 levels in Angry Birds Rio and the update should have already arrived if you previously had downloaded the game. If not, you can head to the Google Play Store or the Apple App Store and download it now.
source: GooglePlayStore, AppStore, PocketGamer via AndroidAuthority