Fez Discussion

So many of you may not know about Fez, but Fez is an indie puzzle platformer made by the smart (but frustrating) mind we all like to call Phil Fish. If you never heard of this guy, just know that he has been known as the most hated Indie Developer in the gaming community, going off on a tantrum at one point and cancelling Fez 2 which will sadly never see the light of day. Fez though overall is a challenging and compelling game, with nice cute visuals, and clever gameplay. I won't go explaining the story here, but you can search for the game yourself if you like.

For those who have played Fez:
What was your favorite challenge or Puzzle in the game? Did you rage quit on this game at times? Did you finish this game? Did you ever 100% this game? Which ending of the game did you like the most?