This is a wonderful game that brings back many nostalgic
memories from my childhood. Upon replaying this game, I have found this game to
have aged very well and I hope this game has a chance to find it's way into the
hands of the younger generations.



I want to now go into greater details on my scoring. Overall: I rated a '9'
because it is a wonderful game. This is coming from a guy who is not the
biggest fan of side-scrollers. However, with that being said, I still love this
game. The graphics do what they are supposed to do. They are bright and
colorful, they represent what they are supposed to represent. The graphics are classic and have aged very well in my opinion. The sound effects are classic and have been the inspiration for future games and Internet videos and homemade games/hacks. The music has a nice composition and has become staples in future Mario games. The music is catchy and you may find yourself humming certain tunes after long play throughs . I have a few things to say about the addictiveness of the game. This game has the potential to last less than 10 minutes if you know what you are doing from beginning to end; or it may last  a few hours depending on if you use online resources like gamefaqs or You tube. This game has a percentage (I think) for level completion. Many levels have 1 normal exit as well as a secret exit. To complete this game you will have to find all the levels and paths that make up the over world map. Some people may want to compete this challenge. I am unsure if there is an end game bonus for this completion. But this adds to the depth and difficulty.
I rated the story as a '3,' not because it's a bad game, but it is a typical Mario game. It is the same story we are all used to. I find it almost impossible to spoil the story of this game. Princess gets kidnapped, Mario and Luigi and now Yoshi all jump in to save the day. King Koopa has his Koopalings. However I find that there are a few differences between them and I cannot distinguish them by visuals, except from the text of the game. There IS actual text in the game, but is unnecessary. The game can be played with out reading any of the text boxes.
This game is not the deepest game. Do not judge this a good thing or a bad thing. Some movies are fine being shallow and entertaining, like the movie Penguins of Madagascar. This particular movie is shallow and entertaining as can be, and I like it like that. Super Mario World is not a 'deep' game. This is like the Pixar; or Dora of video games. It is simple and entertaining. The depth of this game comes from brilliant platforming  and trying to find the secrets of the game. This game, like many other Mario games, is like Chinese checkers: easy to learn, difficult to master.
As stated above, this game is easy to learn, but only somewhat difficult to master. This is not the most difficult game, but this game is not suppose to have unmerciful, grueling difficulty like certain ROM hacks of Super Mario games. I found some of the areas on the over world were more difficult than the final dungeon or final area. This is a game even I could beat this game as a youth and now as an adult.
Overall I highly recommend this game to ANYONE of this generation. It is a retro game, so playing this game is getting back to your roots as a gamer. You get to see the birth of Yoshi, as this is Yoshi's first game.

Thank you for the advice. I just started writing reviews and am still developing my own style and outline. Happy gaming!!!