Star World is the eighth world of Super Mario World, which can be reached by one of the five Star Roads.
Each of these levels have a Baby Yoshi inside, when the player gives them five enemies to eat (or one power-up) the Baby Yoshi will turn into a fully-grown Yoshi and will get unique abilities depending on its color. From the Star World, one can also get to the Special Zone.
To beat the Star World, the player needs to find the secret exit of each level. Through finding Star Roads and clearing stages in the Star World, the player can take shortcuts in completing the game. The Star Roads link to Donut Plains, the Vanilla Dome, the Twin Bridges, the Forest of Illusion, and the Valley of Bowser.