Pet Rescue Saga Level 522
Target: Save 10 pets
Use matches beside the locked blocks to remove the mesh from them while you bring the key down, or use your first rocket to get the key.
Once mesh is off all (or most of them) unlock the key.
Use your rockets in columns that don’t contain matches.
If you have a locked block low in the game it can be used to slide the blocks under to knock pets off the top.