Designed to make you fail. Even the "easy" levels are designed in such a way that it is extremely challenging to win without using the power ups, and said power ups cost an exorbitant amount of money. For example after playing 50 levels I had enough coins to pay for 1 power up that can only be used once. This is designed to force you to spend real money to make any sort of progress and the story isn't even good. Would recommend other swap three games like switchcraft instead.