I have been playing Super Mario World religiously for over 25 years, and I didn't even know most of these. Still, we have assembled twenty hidden secrets about the classic platformer which might not be entirely unknown, but which are certainly much harder to come by.
With a game of such notoriety, it is an incredibly difficult task to come up with a list of things that people might not already know about it. When you include the numerous re-releases on Game Boy Advance, on the multiple versions of Nintendo's Virtual Console, and now on the SNES Classic, there is a really good chance that even people who haven't played the game will have heard of its many secrets and strategies simply by being a gamer with an internet access.
Having sold over twenty million copies, and being the game to be originally packed with the Super NES, it's safe to assume that most gamers have at least tried Super Mario World.