Theme 2-5 (AKA Rock Castle) is the twenty-sixth level in Angry Birds. This is the first appearance of the Black Bird. It features four Black Birds and four pigs in a structure entirely out of Stone bricks.
Shoot the first bird so that it lands somewhere in between the first and middle structures. The force of the explosion shall topple over the first structure and capsize the middle one. Use the second bird to hit the base of the third structure, so that too falls over and the rubble kills any surviving pigs from the first bird. The 2 final unused birds award the player 20,000 extra points.