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This is a tough, long level. You need to save 5 Pets and get 3,000 Points. To achieve this, start getting rid of the blocks at the top. Don't use the springs too often, and avoid the spiky green balls. As you move further and further forwards, use the Column Buster Boosters on the green balls. When you disrupt the Green Ball it knocks off your blocks and multiplies, so try to avoid affecting it too much and target it with the column blasters when available.
Here you can find embedded videos showing walkthroughs of all of Pet Rescue Saga's levels, continuing, in this section, with levels 201-207.