Welcome to the Pet Rescue Community
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There is a pattern to the locked bricks. First you have to click on the left side to start the viruses multiplying. Then begin breaking blocks on the right. Every fourth click drops a locked box for your pet to climb up on. Keep an eye on the virues. They only infect by diagonals. You will need to adjust the virus blocks by busting a set of color blocks 2 or 3 more times as you continue to drop locked boxes. By the time all boxes have dropped and your pet is at the top, the entire left side should be yellow viruses. Click the virus and watch your pet fall free to the ground!