Here’s a cheat you can use to play other locked worlds if you’re can’t stuck with any of the stages and can’t complete a world.
Here’s how to do it:
1. Go to a World Select Screen
2. Center a locked world on your screen
3. Hit the back button on your Android phone until you exit Angry Birds
4. Load Angry Birds back up
5. When you see the ‘Play’ button, tap the button repeatedly
6. You’re now inside a locked world