A glitch may occur in Super Smash Bros. Ultimate if Mario is fighting Simon.

If Simon performs one of his aerial attacks that acts as a tether recovery at the same time as he is hit by Mario’s Cape, Simon will flail wildly while dangling off the edge, as seen in the footage.

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Super Donkey was a platformer that was in development for the SNES from 1991 to 1992, parts of which would be used as the basis for Yoshi’s Island. The game was never publicly revealed by Nintendo; its very existence is only known due to internal development data surfacing in 2020.

The main character in Super Donkey’s playable builds, found in Nintendo’s internal archives, is a pilot character who resembles either the main character from the 1981 Sky Skipper arcade, or Stanley the Bugman from the 1983 Donkey Kong 3 arcade, drawn in a Rayman-like “floating limbs” style. Most available material for Super Donkey features variations on this character. However, the development files also include graphics for the main character being Mario himself, suggesting the developers have considered (however briefly) to turn the game into a Mario game.

This compilation shows all available versions of the main character’s graphics. Note that these run the gamut from the original pilot, to the pilot with Mario’s mustache, to Mario with the pilot’s clothes, to just Mario. Note also the unique armor worn by the character in the bottom left.

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Cover of an official 1992 Japanese guide for Super Mario Land 2, featuring an original illustration.

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In Super Mario Kart, items work differently for CPU-controlled opponents than in later games in the series. Instead of being subjected to the same system as the players, the CPUs are able to spawn an arbitrary amount of items without needing to collect them first; the type they spawn depends on the character. Peach and Toad’s item is the Poison Mushroom, which shrinks everyone who touches it, similar to the Lightning Bolt item.

CPU opponents are coded to always want to avoid Poison Mushrooms to the point that this results in them being unable to remember to drive straight in situations where this is necessary, such as a ramp leading to a large jump.

The footage shows what happens when Peach places a Poison Mushroom before the jump across a section of the track in Mario Circuit 2. Every single CPU avoids the Poison Mushroom in a way that their jump no longer reaches the opposite side of the track, landing in the section they are supposed to jump over and being trapped in a loop.

Note how when the footage speeds up, the drivers on the bottom screen can clearly be seen driving around the loop with no way to get out due to being too afraid of the Poison Mushroom.

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Diskun was a mascot for the Famicom Disk System, a Japan-only add-on for the Famicom. He was featured heavily in promotional material and was even referenced in Mario games as e.g. one of Mario’s Mystery Mushroom consumes in Super Mario Maker, or appearing in Booster’s toybox in Super Mario RPG.

Left: development files for Mario & Luigi: Superstar Saga contain a sprite of a seemingly evil Diskun, intended to be an enemy. Unfortunately, only a single sprite of it exists and no code remains, so that its intended behavior and attacks are unknown.

Right: Diskun’s regular non-evil design, for comparison.

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The Toy Time Galaxy theme from Super Mario Galaxy and the Supermassive Galaxy theme from Super Mario Galaxy 2 have the same melody, but different basslines. These are never heard together. In this post, the two tracks are overlaid to play both basslines simultaneously.

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In Super Mario Sunshine, if Mario recovers from a slide onto a non-slippery slope, he will be able to run faster than usual as long as he keeps running.

The enhanced speed will disappear if Mario stops, jumps, or leaves the slope. This can be most easily seen on the roofs of Delfino Plaza, as shown in the footage.

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A 2004 issue of the Japanese Nintendo Dream magazine featured concept art for various Power Shots seen in Mario Power Tennis (please zoom in to view details).

Of particular note is the artwork for Waluigi’s Swimming Return (top), which features a unique swimsuit that does not appear in the finished game, where Waluigi simply swims through the air without changing his outfit.

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“IceMan” is an unused enemy found in the files of Super Mario Galaxy, likely intended to be a boss. He has no collision or other code that would make him functional, but he does have a few animations, among them idling, slamming the ground, swiping and throwing.

The objects he would have thrown are called “IceManIce” and are ice chunks that were repurposed as the ones Baron Brrr shoots in the finished game. As such, it is possible that IceMan could have been an early version of a boss concept that ultimately evolved into Baron Brrr.

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Immensely rare Super Star plush from a limited edition 1996 Super Mario RPG plush set from Japan.

The plushes were only available as prizes from a small number of claw machines, and despite their relatively unremarkable appearance (since many other similar-looking Super Star plushes exist), are now so sought-after that they are regularly sold for $2000-$3000.

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