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Hi @lindamay16 Level 7704 is a hard one! It took me a while but it can be passed without boosters or extra moves.
The main things to note is that only one butterfly can be on the board at a time and both the butterflies and paint cans fall randomly.
This means that you have to get lucky with what falls and hope you get the correct paint for the butterfly that you have on the board.
If they don't match, use the paint you have (so another will fall) and save those blocks until you need the other color.
If you like you could also remove butterflies and/or paint with rockets or line blaster boosters (if you have them) so that more, hopefully the correct colors, will fall.
Also, remember that at least 16 blocks (at one time) are needed for each butterfly, so wait until you have a group of that many blocks the correct color (three paint cans full) before using them.
Here is an example, I hope it helps?