I beat it by not clearing the drones that are locked in at the bottom of the screen. That funnels the pizzas down in the three valleys left with the blocked drones. When you group five drones above or below the pizzas as long as the bottom is still blocked, the pizzas have only one way to go, down. They won't kick off to the sides. That and with a lot of luck, you will beat the level. It took me awhile to figure that out. I'm stuck on level one thirty now. Lol.