Yoshi's Island Is Officially A Yoshi Game, Not A Mario Game
Briefly

According to Nintendo's official categorization, in a space dedicated to careful cultivation of its own history, Yoshi's Island is not a Mario game.
One exhibition room has space dedicated to specific franchises, separated into individual categories, with the Mario franchise display being the largest.
Ryckert vowed to incessantly bother his Nintendo contacts until this so-called mistake is rectified, indicating the possibility of Yoshi's Island being recategorized.
Yoshi's Island stars Yoshi as they ferry a baby Mario across colorful islands, available as part of the Super NES library on Nintendo Switch.
Read at GameSpot
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