I doubt anyone will care, given all of the possible SNK leaks and the ads indicating that Banjo will be released in less than two weeks, but I beat Super Mario World! It's a game that's been on my backlog for a while now - I'd beaten the final boss before (I got a used version with a 100% complete save file), but I hadn't played the entire game start to finish before.
I found it was a lot more forgiving than Super Mario Bros. 1 or 3 - being able to go back to any level, regardless of what point you're at in the game, was a huge help in terms of making sure that I was stocked up on power-ups. (in Mario 3, I'd run out of power-ups by world 3 or 4, forcing me to subsist on whatever the level had to offer and having to make it through most of it as small Mario) I found that the Fire Flower was significantly less useful than the Cape Feather, so I mainly stuck with the cape for most of the game.
It felt good to play through the game and see why it was so beloved, as opposed to skipping straight to the final boss. Next on my list is Zelda: Ocarina of Time; I always got stuck in the Water Temple or the desert temple, so that's another classic game that I haven't beaten. I'm going to start from scratch and try to avoid using guides, though I might not be able to resist the temptation to use a guide for the Water Temple.