how is difficulty of levels determined?

misscowgirl0131

My bubblegum hill levels are so difficult that I cannot win without spending a fortune buying gold and other power ups. And I do not plan on spending money ant any team. 

Randle

That chocolate just keeps coming back too fast! Luckily it´s optional to play or not.

It wouldn´t be a challenge if it wouldn´t be challenging, I guess.