Wow! What A Great Game! Super Mario World Is Likely The Best Mario Game On The System. You Travel Through The Mushroom Kingdom With Your Prehistoric Pal, Yoshi! He Can Eat Your Enemies With His Long Tongue. Also, When He Eats Enough Fruit He'll Hatch An Egg Which Will Have An Item For Mario Or Luigi To Use. This Time Around Bowser Isn't Alone, Like In Super Mario Bros. 3 His Koopaling Children Are Back With Even More Power To Stop Mario And Luigi From Saving Princess Peach. 

Graphics - Compared To The Others On The System Super Mario World Has Great Graphics! The Colour Palette Used Is Very Cheery And Makes The Game More Appealing For A Family Game. 10/10

Sound - The Music In Super Mario World Is Pretty Good, It's The Same Song Changed To Fit The Level But It's Pretty Catchy! 8/10

Addictiveness - This Game Is Pretty Tough If You Want 100%. You Won't Be Able To Beat This Game In One Sitting, You'll Have To Keep Coming Back As You May Have Missed A Yoshi Coin Or A Star Road Pathway. 8/10

Story - Well, To Be Honest This Is A Mario Game. You Don't Need A Story! It's Recycled From The Other Games But It's Enough For You To Tell That The Princess Of The Mushroom Kingdom Has Been Kidnapped. 6/10

Depth - This Game Is Packed With Secrets And Most Of Them Aren't Even Hinted! So You'll Be Checking Pipes And Walls For Secrets! This Game Is Also Pretty Big Without Even Trying To Get 100%. Also This Game Has Secret Worlds So Look Out For Those! 10/10

Difficulty - Like Every Mario Game, The Game Will Get Harder As It Goes Along. But Thats Not A Bad Thing As Players Will Want To Beat The Level Even More! ( By The Way If You Just Started Playing Watch Out For The Bonsai Bill On The First Level.) 6/10

Overall This Game Is Awesome And Totally Worth The Viz! You Will Play For Days And There Will Still Be More To Go Through! Super Mario World Is A Must Play! 9.5/10

Super Mario World is for me, one of the hardest Mario games ever. But Super Mario Bros 2 is the hardest ever made.

Super Mario Bros 2 wasn't too hard for me to beat (though that's mostly because I found some really nice warp areas), but I don't think I've ever beaten the Lost Levels.  As for Super Mario World, it's one I keep playing.  When I go back to it, I get amazed when I find something I missed before, such as the back door into Bowser's castle.  The super secret levels are awesome, and the different Yoshis brought a level of strategy to the game.

I never knew the koopalings existed on Super Mario World .Until i want on http://www.mariowiki.com/ I was looking them  up  when i saw the details that they was in it..How do you get to their levels?

death_nation : They Are At The End Of Each World. Like Bosses.

drago : I remember beating the game but i don't remember facing the koopalings.Are you sure about that? Maybe they are in the hidden levels.