Yoshi's Island 4 is the final regular level from the first world of Super Mario World, Yoshi's Island. It is only the third level that is required to play in order to finish the game. This level introduces the concept of water by using Layer 3 Low Tide. It is also the first to feature Floating Mines, Cheep-Cheeps, Floating Platforms, and the Star power-up. So far it is the shortest regular level, at a minimum of 13 screens.