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Truike, here are tips to complete Level 1278.
Use the line blasters to not only free the Pets that they can reach, but to clear large amounts (whole columns) of blocks at a time
This will build up the booster more quickly and collect more of the colors that fuel the butterflies.
It helps a lot in this Level if you are lucky to get a few butterflies of the same color to be working on filling at the same time.https://www.youtube.com/watch?v=bqmNwlTw7_w