Get under a vine thingy or metal fence thingy or anything that you can climb up.
Pick up something that can be picked up, like a P switch or a shell. Get under the climbable thing, throw the item up, jump, and hang on to vine/fence.
You SHOULD see this: you hanging on to the fence/vine, and the shell/key/P switch above your head, falling down. Now all you have to do, is hold UP and B
(UP and Y if you're playing on SNES) and TADAAM! You're climbing AND holding something AT THE SAME TIME!

After you beat ludwig at castle#4. You will be able to go to "forest of illusion". Go into "forest of illusion 4" and just as you start the level you will see that thing in the cloud with an EXTRA LIFE on his fishingrod.get the life off him, then press start and select "back". You should have an extra life and you can keep doing this for as much as you want. its quick and easy and also helps in deeating bowser (sorry if i spoilt it for you) but i hope i helped.

On most enimies with spikes such as ball n' chains, boos, grinders, hotheads, and spinies, you can bounce off them with a spin jump. Note: this works with other enimies, experiment to find others.

On most enimies with spikes such as ball n' chains, boos, grinders, hotheads, and spinies, you can bounce off them with a spin jump. Note: this works with other enimies, experiment to find others.

Get all the dragon coins on all the levels to get princess coins.

There is nothing to get for getting them all but it may be good.