Playground Rumors
Youtuber Mathew "MatPat" Patrick once theorized that Mario belonged to this political party
Communist Party
Mario Kart Wii - Maple Treeway
In Super Mario Galaxy 2, this galaxy is home to the mysterious "Hell Valley Sky Tree" figures in the skybox
Shiverburn Galaxy
This Mario Party game was the only one that allowed you to create your own custom list of minigames to play
Mario Party 4
Super Mario Odyssey - New Donk City/Metro Kingdom
Within the blackout segment of Luigi's Mansion, a glitch with the lighting sparked a popular fan theory that Luigi is actually what?
Dead
The name of the bonds between characters in the Mario Baseball series
Chemistry
Yoshi's Crafted World - What's It Gonna Be? / Slot Theme
In Super Mario 64, a statue supposedly stated this message, leading people to believe that Luigi was secretly playable
L is real 2401
Petea Piranha (yes I WILL ask you to specify)
These two classic Mario Party games were the only ones without Bowser boards (MP 1-8)
Mario Party 3, Mario Party 6
Mario Superstar Baseball - Wario Palace
Nintendo Power circulated a rumor stating that evolving this pokemon in pokemon Red and Blue would allows you to obtain Yoshi
Dragonite
Bowser's Block Party / Block Bowser
Paper Mario Sticker Star - Sling A Thing / Thing Theme