Angry Birds POP! Level 4 is the fourth level in Forest and the 1st Pop the Top level in Angry Birds POP!.
To pass this level, you must clear the six bubbles at the top row and score at least 4,000 points in unlimited bubbles or fewer. When you complete the level, remaining bubbles and obstacles will reward you additional points.
This is the tutorial level that will teach you to play Pop the Top levels.