Danger Zone D-20 is the twentieth level in Danger Zone. The objective of level D-20 is to use the birds to eliminate all the pigs. Get at least 90,000 points for 3 stars.
Getting 3 stars is very hard.
Send the Blue Bird around the southern of the left planet, splitting when it finishes the loop. Repeat the shot with the Lazer Bird, but redirect through the bridge above. Debris will trigger the TNT and potentially both icy asteroids if you lucky enough.