For those looking to get the hard badge quick(er) a good strategy is to max out Fire Spread ability first and then develop the Rapid Fire ability. These two abilities dish out the most damage over all. Lastly, I cant stress this enough: don't waste time with the blue abilities, except to get the ability master trophies, as they are too generalized and slow. Let me know if this helped anyone by giving this comment a rate up!
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