Loft the Pink bird to land atop the pebbles and TNT in the center of the level. One way or another, the right side of the level should be cleared. Use an elongated version of the Reverse Remi Shot, sending the Boomerang bird backwards and down, spinning it through the bottom-left corner of the structure. The TNT cake will cause the towers to implode, and while destruction may vary, you should have enough points for 3 stars. But if the towers not collapse, it will be easier to get high scores, so you can shoot him straight to the structure, straight into the TNT cake or high up and boomerang back to the structure with this second shot, just don't let all of the parts of the towers collapse. Then, shoot the third bird (Pink Bird) into the center of the structure and blow bubbles to finish the towers.