about angry birds rio

Many little birds were caught in a trap, they were drawn into an abandoned warehouse and closed in iron cages. Kidnappers are gone, and now it's the time to release them.Try to hit the cages or those empty cardboard boxes to tear down the cages, they will break in pieces and birds will fly away. Some cages are more resistant and will break only if you hit them. Release all of birds to get to the next stage.