Why does everyone act like this game technically didn't happen? Just because Mario was asleep for the adventure, doesn't mean a thing, considering that Subcon is the land of dreams. It just bugs me when people say things like: "SMB 2 was just a dream, so Peach and Toad were never heroes and it's just what Mario wishes would happen." I mean, it's not like Sonic '06 where the game wiped it's continuity, and so many elements from it were integrated into the mainstream Mario universe. So why is everyone so adamant it never happened?
Let's not forget the ACTUAL Super Mario Bros. 2. And let's also not forget what the game actually is. The game is technically canon if that's where your coming from.
Actually in the Japanese re-release Mario USA it does seem to imply that Mario and his friends saved Subcon in their sleep, but does it really matter when the Super Mario Bros. series has no official series canon outside of maybe the rpgs, and spinoffs like Yoshi's Island, and Wario land? Then again don't forget that the enemies that originated in Doki Doki Panic are now just as much a staple of the Mario series as any Goombas or Koopas in the first Super Mario Bors. Plus elements like Luigi being taller than Mario were kept in fact the next Mario game brings elements from this game back.