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Hi @michellefarmer - it's not green tiles that need to be removed, but the virus blocks
From our tips:
Infected (Virus) Blocks
We all know how quickly a virus can spread and this virus block does just that!
When you have virus blocks on your game board expect them to spread one block each move you make.
Also, to make things more difficult, these viruses prefer to travel diagonally.
Viruses can be removed with the boosters, but also come off the board in groups, like the matched color blocks.
Sometimes it is advantageous to remove the virus as quickly as possible from your board.
In other levels (especially when moves are limited) it can be better to let it spread and remove a large area of virus blocks in a single move.
Pet Rescue Saga Level 2491 shows these nasty virus blocks spreading!