Unfortunately it is not possible
you must hack or cheat to make this option available
I dont think there are any action replay invincibility codes for Super Mario World on gameboy.
1208b350 0000027c
a b up
You have to download the cheat use the wizard.
Yes. You must find a Rainbow Star to be invincible.
You cannot really kill ghosts in Super Mario unless you have an invincibility star in use. However, you can stop them by looking at them, which makes them cover their faces.
AA bba a lr for more codes type in www.gamespot.com
Super Mushroom Fire Flower Propeller Mushroom Ice Flower Penguin Suit Mini Mushroom Invincibility Star
Mario i think
Yoshi was in Super Mario World but has never been in a Mario Bros. Game. that is, until New Super Mario Bros Wii comes out.
Sorry to disapoint you, but Super Mario Galaxy for DS will never come out.
never...