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Hi @lisamo
It really is a difficult one!
The way I completed it was to firstly, try not to remove any blocks the same color as the butterflies (save them for a bigger group!)
Then once you've built up the earned booster, start with the color whose paint can is lowest.
Try to use the in game earned paint booster, plus the one already on the board at the same time. Join them to some of the same color already on your board. This should make a large enough group (at least 16) to open a butterfly.
Use the same method with the next lowest color then the last one.
Good luck, below is my example so you can see how to do it π