List of Super Mario World 2: Yoshi's Island pre-release and unused content

This is a list of pre-release and unused content for the game Super Mario World 2: Yoshi's Island.

Early iteration
Nintendo's marketing department initially pressured Shigeru Miyamoto to have the game use pre-rendered 3D sprites similar to Donkey Kong Country. The 3D models of Baby Mario and Yoshi used in the introduction are leftovers of this period of development.

During development, the game was subtitled Super Mario Bros. 5 on the Japanese logo, and was referred to as such in at least one preview. This was shortened to Super Mario in the final Japanese title, although the English localization retained the connection to Super Mario World. Additionally, the game was said to be in development for the add-on.

Several gameplay mechanics were tweaked from early builds, such as Yoshi performing Egg Throws closer to how they will in the Super Smash Bros. series and being able to lick up yellow walls of dirt, as well as Piranha Plants needing to be touched to pop after withering.

Early concepts
In late July of 2020, the source code for many prototypes of Super Nintendo games were dumped online, and include many sprites showing various entities in different stages of creation, as well as wholly unused concepts.
 * The developers experimented with several concepts for two of five years of development before settling with the final idea of "a game where even though you hit enemies, you don’t die". One of them was to have Yoshi move independently from Baby Mario and guide him around the levels.
 * The Powerful Mario form was originally supposed to transform Baby Mario into an adult, mustachioed version of himself, but it was pointed out this concept would seem strange. Shigeru Miyamoto joked he still prefers this early idea to the final version.

Unused Music
The following music sounds distorted in places. They are related to the main theme, which suggests that they might have been used at one point during development but were scrapped. The MIDI data contained might have had parameters changed.