Super Mario World
Enter a level with Yoshi, Cape Mario, and a Fire Flower in reserve. Position yourself under a berry in a way that you can get the fire flower and get the berry at the same time. If you happen to eat the flower and the berry at the same time, the game will freeze. Several things have been reported while using this glitch. Sometimes when the game freezes, your coin count will rise until you quickly have 99 lives. Press Start and Select to exit the leve. One person's game froze, horizontal lines appeared on the screen, and weird music kept looping over and over again. Then came a buzzing noise, and he was returned to the file select screen, with his file deleted. Thankfully, that's not normal. Even so, this is an interesting glitch to exploit every once in a while.
Contributed By: Wheelman2004.
Use, but not waste a switch
First all you need to do is find a switch ( the kind that changes the square outlines into brown blocks ). You also need to be on a yoshi. Normally when you hit the switch, it will flatten and disappear. When you jump on it, quicky turn around and eat it with your yoshi, if you do it fast enouph, you will have it in the yoshis mouth. You can spit it out and use it again.
Contributed By: Kylermannn.
Inverted World Map
Complete The secret world. (With Stage names Such as Awsome and Tubular.)
And then Enter the second Star road that Appears after you Complete "Funky" And the world Map will Have A diffrent Color Pallete and some enemies will look different.
Contributed By: CalvinZ.
Easy Extra Life
Beat a stage with your time ending in the same digit repeated twice as the tens place of your Star total, and you'll be awarded an extra life.
With 17 stars, beat the stage with your time ending in 11.
Contributed By: Juggling Joker.
Hear SMB remix
If you sit at one of the levels in Special World for about 2 minutes, you'll start to hear a Super Mario Brothers remix!
Contributed By: HyperSilence.
Item Conversion at the Goal
Try holding an item (shell, trampoline, etc) and cross the Goal line. The item you're carrying will turn into a 1-Up mushroom.
Contributed By: discoinferno84.
Re-enter Castles you have already beaten
When you beat a castle you normally cannot enter it again.
Go to the castle you want to play again and Press L+R at the same time.
Contributed By: MI4 REAL.