Do not shoot any bees as the come down. After all bugs are lined up and ready to go You will see two bees to the far left of the screen one on top of each other. Do not shoot those two bees. Kill everything but those two. After those two bees are left let them fly around and avoid them. I repeat do not shoot those two bees. After about five to ten minutes those two bees will quit firing. When they quit firing shoot them. The rest of the game none of the bugs will fire at all. This code works for level 1,2 4. After that if you haven't gotten them to quit firing start over.