Theme 22-4 is the fourth level of the last world of the episode Bad Piggies.
One strategy for Angry Birds Bad Piggies level 22-4 is to send the Yellow Bird towards the second dent on the top rock. With a little luck, the bird will bounce towards the golden wrench. Then send a second bird towards the far right TNT to clear the pigs on the right. Finally, send the last bird into the right TNT to destroy the remaining pigs.