Achieving three stars in all levels of a specific world (like Worlds 4-5) automatically unlocks a Golden Egg.
: A developer-labeled button that often triggers a suite of beneficial effects for testing purposes. Classic Gameplay "Cheats" and Tips Angry Birds Classic Qa Cheats
Watch the credits to the very end and tap the Golden Egg that appears behind the Rovio logo. Achieving three stars in all levels of a
Accessing the internal developer tools varies depending on your platform, but the most common method for mobile users involves specific taps on the interface. Angry Birds Classic Qa Cheats
A famous hidden interaction involves the treasure chest in level 1-8. By holding a click/tap on the chest and typing "open" on a keyboard, you can unlock a secret Golden Egg. Top Angry Birds QA Cheats and Commands