Pet Rescue Saga Level 446
Target: Save 8 pets
First create a balloon by building up your points.
Release pets on one side from their carriers with that balloon.
With the second balloon you earn, release pets on other side.
Then, set off the spring (line blaster) to destroy the entire row of metal boxes.
Unlock with the key and very carefully drop the blocks so that as many as possible of the metal boxes line up with the line blaster (spring) so they can be destroyed.
Make sure the block that is above the other spring is included in this row.
Get the remaining blocks, and metal boxes from under any pets with the last spring.