Danger Zone D-9

Danger Zone D-9 is the ninth level in Danger Zone. The objective of level D-9 is to use the birds to eliminate all the pigs. Get at least 60,000 points for 3 stars.

Difficulty
This is very hard because:
 * Gravitational fields make this level confusing.
 * Getting the target score is not easy.

Strategy
Aim the first Red Bird into the stone blocks of the top-left planet. With this shot, you can usually clear three planets worth of pigs. Use another Red Bird for the remaining pigs.