To replay Castle and Fortress levels you have already beaten, on the map screen stand Mario over the one you want to replay, hold down L and press R (or vice versa). Mario will enter the level, even though you have already cleared it.
Note - if you die re-playing through any of these levels, you will be forced to start the level from the beginning when you try again, even if you break the halfway-point tape.
When you have unlocked the 'top secret area' , hatch yoshi's egg. Then exit. Go back in, and hatch the egg again.Instead, there is a 1 up. Go back out and repeat. This is pretty useful for hard levels.
Okay well my first writing thing. Anyway this I'm not sure this is a cheat but if your interested in the koopa kids they all hhave different names in the dvds and the games.I'll type them down here starting from number 1 castle
Game-----------------DVD 1 Iggy Koopa Hop Koopa 2 Morton.Jr Koopa Big Mouth Koopa 3 Lemmy Koopa Hip Koopa 4 Ludwig Von Koopa Kooky Von Koopa 5 Roy Koopa Bully Koopa 6 Wendy.O Koopa Kootie Pie Koopa 7 Larry Koopa Cheatsy Koopa
And there you have it I look forward to helping in the future
When you enter donut plains be sure you have "Feather Mario" when you enter the first ghost house.(not the secret one) When you enter it one until you reach the first hole. Then turn around and fly as high as you can above the point you started the level. You will discover a secret path on top of the level that ends with three lives and an alternate exit. The alternate exit brings you to an area north of the ghost house. In this area you can get a Yoshi, a life(if you already have a yoshi), Feathers, and Fire Flowers. This level has no enemies and no time limit and the entire level is the size of your screen. I hope this helped!