One of my favorite games as a kid. As soon as I saw it on the back of my SNES box, I had to have it. I remember saving up at least $40 and being happy with every penny spent on it too.
Even though it's not a hard platformer, there's plenty of challenge. Platforms are not your foe this time around, but other things are. But with Baby Mario, and some eggs you'll do just fine.
I loved every single castle the game had to offer. Mini-Bosses were even epic in this game.
Any gamer who hasn't played Yoshi's Island really needs to get their head out of the dirt and get a copy. One of Nintendo's finest masterpieces, and one of my favorite games ever made.