I find the impossible badge a little less frustrating than the levels. While the endless requires you to memorize a few patterns, and how you plan to solve each, the hard one is solving bigger problems, but with your progress saved. Fortunately no death count for the hard badge :D
 "NGU IDLE")
 "Pandemic 2")
 "Lynk")
 "Tales of Nebezem: Elemental Link Part 2")
 "Medieval Chronicles 3")
 "Dibbles 4: A Christmas Crisis")
 "Faraway: Puzzle Escape")
 "Words Warriors")
 "Last Legacy: Null Space")
 "Earn to Die 2: Exodus")
 "Mu Complex : Episode Two")
 "'Til Cows Tear Us Apart")
 "Pursuit of hat 2"){kind=icon}
 "oO")
 "Strikeforce Kitty 2")
 "Road Of Fury 2")
It's a bug that has been introduced because of an update of the engine used for the game, it is now fixed.