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Level 1
I can never get enough of the right colour blocks, and never manage to save more than 4 pets, rather than 6.
This level is made easier if you get several butterflies of the same colour (3 would be ideal!) as they can be filled at the same time as each other. Only make small matches until you have some butterflies drop, then make larger matches to charge them up.
You should also definitely paint the 2x blocks so you can you use them but try to save some until later on in order to clear a larger group.