Hello. My mother is playing this game but she doesn't speak english so here I'm instead of her. She's got a small problem. She already unlocked alot of worlds and played it for few months already....
@deniskozelcz Like everyone else, your mother can look at these keys and wonder why they are there. This is NOT a smartass answer. The keys have no function or meaning. One of the developers admitted as much on the PVZ2 Reddit site. It is simply a legacy result of their new coding for Penny's Pursuit. It isn't worth their time to fix this annoyance. Sorry your moms is confused but this is all we can tell her.