Pet Rescue Saga Level 519
Target: Save 10 pets
You only get two keys in this level, so you need to wait, and choose when to use them to unlock the locked blocks.
Match the largest groups you can to clear the board and allow pets to fall.
Try to break the glass on your keys, but don’t use the first one until you have about half the pets needed on your board (or already saved)
Use the locked blocks to slide your pets over, or under, to get them in a good position to rescue.
After the first key is used, try to get all the rest of the pets down and ready to rescue before unlocking the second key.