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The noobs on App Store say Frostbite Caves is impossible, and complain about In App Purchases. Without the IAPs, the game wouldn't make money and would be less quality.
I honestly say PvZ2 is well balanced, but a bit hard. I beat every level in PvZ2 without power-ups, boosts, or premiums.
Dark Ages & Big Wave Beach aren't that hard, but still pretty hard. I can understand why people complain, but about AE - Day 11? That was like one of the easiest levels in the game!