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Regarding current events: I will continue posting my usual content as long as Twitter remains operational. If it doesn't, all content I would normally have posted on Twitter will be posted *in addition to my usual Tumblr content* on my Tumblr account: tumblr.com/suppermariobro…
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Unused graphics found in the data of Super Princess Peach reveal that at some point in development, Goombas were able to experience positive emotions. In the finished game, Goombas are limited to experiencing only negative emotions instead.
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In 2009, a team of nanobiology researchers from Osaka University in Japan genetically engineered three types of bacteria to generate fluorescent proteins in order to arrange them to replicate the Small Mario sprite from Super Mario Bros. as a demonstration.
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A 1986 guide for Super Mario Bros.: The Lost Levels from the Japanese Family Computer Magazine contained many comedic illustrations of Mario and other characters from the game. Below is a selection of drawings from the guide.
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The secret alcove in Whomp's Fortress containing a 1-Up Mushroom is one of the best-hidden secrets in Super Mario 64. Development files show that the alcove was meant to contain a Power Star at some point, which would have been extremely hard to find if it was kept in.
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Super Mario World contains an unused "reaction sprite" for Yoshi, in which he appears shocked or suprised. Below is a mock-up of Yoshi reacting to an in-game event using the sprite.
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Mario Party 4 contains messages intended as disclaimers that the message is missing when an invalid ID is loaded. However, instead of using the same message every time, the disclaimers are all different and appear increasingly more forlorn as the internal message list goes on.
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Unlicensed Mario statue sold by UK garden furniture shop Aston Garden Ornaments, named "ITALIAN MAN".
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The manual of Mario Kart 64 states that Mario and Luigi are "well balanced" and have no "extreme pros and cons". In reality, Mario and Luigi have abysmal acceleration, reaching top speed 2 seconds later than any other racers (57% slower).
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In Super Paper Mario, extra points are awarded to the player for shaking the Wii Remote after jumping on an enemy. The secret to getting the highest score multiplier is to shake the Wii Remote in a way that is not parallel to any of its axes in 3D space. Details in image.
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The Art of Super Mario Odyssey book reveals an early concept for the Seaside Kingdom that was drastically different from the finished game and would have featured the contrast between a beach resort and a haunted horror area with a "realistic ghost boss".
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The Donkey Kong arcade has rudimentary copyright protection where the game crashes if it detects changes to the title screen copyright. However, it only checks the "INTEND" part of "NINTENDO", so that changing the first or last letters results in the game working normally.
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It is easy to assume that the Boomerang Flower power-up was inspired by the Boomerang Bro enemy. However, according to Super Mario 3D Land director Koichi Hayashida, it was actually inspired by Pom Pom instead. Details in image.
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The Game Boy version of Dr. Mario becomes unplayable upon reaching Level 28, as Dr. Mario himself simply fails to appear on screen, causing the round to never start.
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In 2016, Nintendo trademarked the Super Mario Bros. coin sound. Below is the trademark application document, which provides official sheet music for the sound.
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Addendum: as pointed out by reader @EleanorJayynes, there are also in fact Mario graphics used in the BIOS in another spot, the Wii Shop Channel download animation (seen below). I apologize for overlooking these and hope the icon in my post is still notable.
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The Wii BIOS contains this extremely small picture of Mario in its files. As such, Mario can technically be said to have been on every Wii console ever made, regardless of whether the owner has ever played a Mario game on it.
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Opening up the Star Fox SNES cartridge reveals that the Super FX 3D graphics chip is actually called "MARIO CHIP" as printed on the unit. This is an acronym for "Mathematical Argonaut Rotation & Input/Output" (Argonaut being the name of the studio that developed the chip).
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Super Mario Galaxy contains zones called "NoSleepAreas", placed wherever it would be inappropriate for Mario to fall asleep when idling, such as in boss battles. However, no such zone exists in front of Luigi's prison, allowing Mario to sleep while Luigi is pleading him for help.
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The prototype version of Donkey Kong 64 had highly exaggerated animations for Chunky Kong that were toned down in the final game. During his punching animation, his fist would briefly grow to roughly the size of his body.
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In a 1990 interview, Shigeru Miyamoto revealed that a sketch of Mario riding a dinosaur he drew for Super Mario Bros. in 1985 was hanging above his desk for five years until he finally was able to implement Yoshi in Super Mario World.
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When Mario falls off the Wing Mario Over the Rainbow secret course in Super Mario 64, he will fall into the castle moat. However, his health is not reset during this. If Mario falls after hitting a ledge and reaching 0 health, he will instantly drown upon touching the water.
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The Mario game that can be beaten the fastest is Super Mario Bros. 3, which can be completed in 19 frames, or 0.316 seconds, by pressing buttons very quickly during startup to execute unintended code. Below is every frame from starting up the game to finishing it.
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Very early alternate design for Princess Peach seen in an officially licensed January 1986 picture book from Japan.
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Addendum: I apologize for any ambiguity due to the phrasing in the post; the "camera plane" is simply another way to say "the screen". Below are illustrations of what it means for Mario to move parallel or perpendicular to it.
Additional obscure Mario content for suppermariobroth.com.
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