Welcome to the Pet Rescue Community
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The row of caged blocks near the bottom of the board will be really difficult to burst by simply grouping them with other blocks. Use the Line Blaster Boosters in the bottom left corner whenever they are facing the direction of this row of caged blocks until the blocks are completely free from their cages.
Check out this video of a player passing the level, I hope it helps
https://www.youtube.com/watch?v=ebb99llItok
Good luck!