Pig Bang 1-6 is the 6th level of Pig Bang. Notice in Pig Bang level 1-6 that we have a set planetary surface with a limited field of gravity.
It's not hard, but only way to 3 stars is 1-birder.
Zoom out a little to see that there is a wall beyond the bubbled pig. Send a Red Bird off of the wall so it ricochets through the bubble and onto the pig below.