List of Super Mario World 2: Yoshi's Island pre-release and unused content
From the Super Mario Wiki
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This is a list of pre-release and unused content for the game Super Mario World 2: Yoshi's Island.
Nintendo marketing department initially pressured Shigeru Miyamoto to have the game use prerendered 3D sprites similar to Donkey Kong Country. The 3D models of Baby Mario and Yoshi used in the introduction might be leftovers of this period of development.