At this point #3 hasn't been guessed yet so here the second hint for that one, and also the first hint for #2. We're almost there!
#3: Instead of the usual, this game features three different powers; a flying one, an invincibility one and an invisibility one.
Hint 2: You'll still have to activate them for use in levels by pushing a big coloured button at the end of a short level.
#2: The greatest video game story twist ever.