In Super Mario Odyssey, many Goombas can be stacked. The limit for a legitimate Goomba stack is 30, as they will stop spawning afterwards. Manually spawning more Goombas reveals that the limit for an illegitimate Goomba stack is 200. At 201 Goombas, the game crashes.

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In Mario Kart Wii, crashing the game and activating the crash handler will eventually start playing back the contents of the Wii's RAM as sound. Since the data was never intended to be interpreted like this, it ends up sounding like experimental harsh noise music.

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A boat in New Super Mario Bros. Wii is called NICE_BOAT internally. While the developers may have simply thought it was a particularly nice boat, there is reason to assume this is related to the "Nice Boat" broadcast incident where an anime episode was cancelled due to a murder.

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"Classic NES Series Trivia" was a Flash game from Nintendo's site in 2004. The questions were loaded remotely, and could not be archived. Playing the game now results in no questions loading and a purgatory-like experience with blank choices, all of which are declared wrong.

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In the selection screen of Super Smash Bros. Melee, characters are represented by artwork instead of 3D models. However, unused "selected" animations for the fighters' models exist in the files for a scrapped 3D selection screen. Some of these are broken due to being unfinished.

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"60 Second Challenge! Save Luigi!" was an interactive train quiz held on some Japan Railways trains from 2020-2022. The player had 2 chances to select 1 correct answer out of 3 to save Luigi being dropped in lava. Getting both guesses wrong would result in Luigi almost dying.

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Warning: profanity
A photo in the booklet for the official 1993 Super Mario Compact Disco album contains a profane shirt in a photo that likely slipped through due to be being printed so small that it requires extreme zooming to view the swear.

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Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey contains an unused "Toads ramming each other rapidly" test room, containing Peach and three pairs of Toads. Talking to Peach causes the Toads to ram each other rapidly.

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In Super Mario 64, if a shell-less Koopa bumps into Mario while he is asleep, he will enter a "sleepwalking" state, where all of his voice sounds are replaced by snoring. He will continue snoring even when being shot out of a cannon; the only way to wake him up is to harm him.

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In the original GameCube version of Paper Mario: The Thousand-Year Door, the Glitz Pit greeter Toad always bites his tongue after Chapter 3 is over. In the Switch version, this was made into an Easter egg, whereby he always has a small chance of biting his tongue instead.

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