Pet Rescue Saga Level 111
Target: clear blocks 100%
This level is very difficult to do and I found using specific bombs or line blasters to destroy each metal block was the only way to get through it.
The dotted lines around them in each of these pictures, shows which boxes were destroyed by which bombs and rockets.
Try to work your way down the board lining up the metal boxes with the bombs that can destroy them.
Use the rockets to blast away whole columns of metal blocks.