I have finished 51 out of 54 levels for the hard badge but can't seem to find the last 3 levels, I scrolled up and down but can't find the last 3 hidden levels, anyone have any ideas what I might be missing? I found the one at the totem on the bottom, and the 2 other idol looking structures in the other 2 areas.
 "Hexologic"){kind=icon}
 "You are a... Mobile"){kind=icon}
 "You are a... The Sequel Mobile"){kind=icon}
 "Prizma Puzzle Challenges Mobile"){kind=icon}