How to Recieve
Go to Theme 17-12. Zoom out and you'll see a treasure chest high up on top of the second rock ledge. Shoot a Yellow Bird and time the speed burst so he destroys the front and second ledge and it touches the top left corner of the treasure chest.
Shoot the Red Bird so he cuts the rope hiting the rock above.The rock will then fall and will start a chain reaction and kill all the Pigs in the process.