level 21

I can get the first key by matching red birds and setting off fireworks. The problem after that is I'm not finding matches, eggs keep hatching, and more walls start going up that block any movement or matches. How do I solve this without more walls going up?

The other 2 keys are with the cats that are boxed in the walls. After you get the first key you can either free a chick right off or save it for later, but I found that you want to trigger the fireworks at the bottom to blow up some of the walls around one of the cats. Then, it's paradoxically much easier to try to get bombs on the upper half of the screen and blow your way into the walls from the top to reach the cats.

If you have to make a move that doesn't make a match, as you know the eggs will hatch and the small walls will form a new wall. You can move a bird on top of the small wall to keep it from forming. This also works with ravens.