Our strategy for Danger Above level 6-15 is to launch the Black bird head-on into the left side of the first structure, reducing it to rubble. Speed a Yellow bird through the first few balloons above and into the top structure. Use the next Yellow bird to pop any pigs which remain from the first shot with the Black bird. Fire the two Boomerang birds, as necessary, toward the first structure, spinning them into the rubber. They should bounce through the remaining balloons and into the top structure. The score in the video below is 124,760.