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Hi there- Thanks for posting on King Care. I have checked your previous question :-) Pet Coins are a game currency that you earn when you complete the levels. You can use them to buy the Block Buster booster at the start of each level. It looks like a pick axe and for just 3000 coins you receive 3 of the boosters.
Currently you can only purchase the Block Busters with coins while playing on Facebook.
**Please note that these coins cannot be used on mobile.
If you cannot see the coins whilst playing on Facebook please could you share a screenshot of you game so that I can investigate this for you?
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Thanks a lot, and have a lovely weekend!