All content posted on this account complies with a veracity policy that is outlined in this pinned Tweet for easy reference.

In Super Mario Galaxy, the Major Burrows boss was not tested very well in 2-player mode. If the P2 cursor is used to make the player jump too high, his position will desync from the ground and he will float angrily and unmovingly through the air.

Under very specific circumstances that are still plausible to occur during regular gameplay, Paper Mario: The Thousand-Year Door will undergo a "Mario Running Forever Softlock" whereby Mario will run in place eternally instead of ever starting his turn.

Exclusively in the Japanese version of Super Mario Sunshine, there is a physics oversight on a platform in a secret course whereby Mario will be stuck on the ground producing dust. The steam-like dust visuals and sound effects make it seem like he is being fried or grilled.

Addendum: upon even further investigation, reader @zestmcquest discovered that this IS in fact a deliberate change, done on the NSO emulator level as a patch (the ROM is the same, the emulator changes the expression). However, we still do not know why is was changed.

In the Nintendo Switch Online version of Mario Party 3, Daisy's happy winning expression was changed to a more serene/confident one. This is the only expression that was changed. It is unknown if this is a glitch or if the developers believed it to better express her personality.

Unique Mario voice lines by Charles Martinet recorded for a 2009 soundboard on Nintendo's Australian website, including lines like "I love Australia!", "I love the propeller hat!" and "Ah, spaghetti, meatballs, and pizza pie".

In Super Mario 64, tiny slivers of exposed out-of-bounds areas will cause Mario to bonk if he collides with them. However, the exact same scenario in Super Mario Sunshine is much more cruel to Mario. Here, instead of merely bonking, Mario will break his spine.

Sound Fantasy was a cancelled SNES game that would have used the SNES Mouse to draw pictures to turn into sound, like a musical Mario Paint. A prototype of it surfaced in 2015. One of the sample images is this unique illustration of Mario that plays the Happy Birthday song.

Experimental post: The Duality of Whacka In the Switch version of Paper Mario: TTYD, Whacka can finally be fought, and has a suspiciously specific 108 HP. The game both offers a ridiculously simplistic explanation for this as well as a complex one steeped in Dharmic symbolism.

It is possible to beat Donkey Kong Country 2 completely pacifist using a combination of secrets and glitches, allowing no enemy or boss to be harmed. Ironically, getting the true ending destroys Crocodile Isle, killing everyone on it anyway.

When starting Donkey Kong Land, there is a 1/8 chance the game will boot in a "paranoid ducking state" where Donkey Kong will constantly look around while ducking. This is actually a fault of the random number generator, which "locks in" to a single value and fails to be random.

In the Mario Teaches Typing games, Mario never criticizes the player for underperforming and tries to be understanding and supportive. According to Charles Martinet, that was his initiative, as he felt being negative would go against the core principles of Mario's character.

Donkey Kong 64 contains unused text that would have referenced the Gold Skulltula sidequest from The Legend of Zelda: Ocarina of Time as a joke explanation for Donkey Kong not being able to do something.

Super Mario Sunshine is surprisingly more realistic than later Mario games in one specific aspect: here, Mario will start drowning if he hangs on to a ledge in such a way that water is flowing into his nose and mouth, as one would in real life.

The Switch version of Paper Mario: The Thousand-Year Door includes its own fictional language that is a cipher for English. Amusingly, the misspelled "Game Cuve" graffiti from the original version is translated into the new language... but still reads "Game Cuve" when deciphered.

In Paper Mario, Mayor Penguin is found seemingly dead, with Mario being suspected of his murder. However, if a letter is delivered to him during that time, he will get up, thank Mario, and promptly go back to being dead. Unfortunately, this cannot prove Mario's innocence.

Shigeru Miyamoto has claimed that Toad is his least favorite character in Mario Kart. Despite this, in all footage of him playing Mario Kart 8, he picked Toad every time. Whether he was joking or specifically picking a character he hates to challenge himself is unknown.

Paper Mario: The Thousand-Year Door inadvertently depicts Peach as the quickest typist in the world. She is able to type up a 126-word email in exactly 3 seconds, making her 8 times faster than the current typing speed world record.

Many games for the GameCube use only a fraction of the storage capacity of the disc. I have analyzed the data to determine what the maximum number of retail Mario games that can fit on a single disc would be, creating the Luigi & Wario + Puzzle + Rhythm Maximum Value Pack.

For low-quality models used when racers are too far from the camera, Mario Kart Tour uses a simplification algorithm with seemingly no human curation of the result. The racer who is hit the worst by this is Wendy Koopa, whose model becomes mangled in various ways.