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In this Level the Pets do not appear until you have removed ALL the metal blocks.
The in-game rocket booster can be earned quickly with big matches and by using the bombs
Blowing up 3 bombs usually removes enough blocks to build up a booster.
Use the rockets to destroy the metal blocks until they are all gone.
When you have done this all 30 Pets will fall within the next few moves.
The trick is to keep those moves where there is an easy path down for the Pets.
Then you can complete the game with the limited moves that are left.
Here is an example of the same level as it often appears as Level 10 in the Weather Alert: