Pet Rescue Saga Level 684
Target: Save 9 pets
The first aim in this level is to try to open up all the carriers.
Drop the carriers down and blocks in matching colors should fall, (these are random though, so can be hard to find)
Get the mesh off the blocks and use them to open the pet carriers, try to open the top carriers while they are still high in the game, it can save moves that are limited.
Free as many of the pets from their carriers as you can and get them as low in the game as possible, before you open the locked blocks.
When you see it say 30 moves, the next move (in a column without a locked block) will bring the key, so choose which one you want it to drop in, (one with an easy path to the bottom)
Choose large groups of blocks that will clear and drop the pets quickly.