The 2003 Chinese official trailer of Super Mario 64 for the iQue Player (the China-exclusive plug-and-play version of the Nintendo 64) features a unique arrangement of the Metal Cap theme from the game. It appears to be a MIDI version of the song that was possibly downloaded from the Internet and converted to MP3 using a soundfont for the trailer.

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In Super Mario Bros., a bizarre code oversight results in some enemy types changing species if they are hit from below while 14 to 18 pixels away from the left edge of the screen specifically. A Spiny will turn into a green Koopa Troopa, while a green Koopa Troopa will turn into a red one, and finally a red one will also turn into a green one.

The footage shows all three of these interactions happening by using a Multi-Coin Block so that the enemy can be hit several times in a row. Note the enemy changing species three times in sequence. The change is permanent; the newly created Koopa Troopa will eventually get back up and resume walking, being identical to a regular Koopa Troopa.

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In Donkey Kong Bananza, the Ostrich Bananza Rehearsal post-game challenge features a gliding section between the beginning and the big triangular platform that splits into two paths.

If the platform is approached while gliding in such a way that Donkey Kong would hit the edge, it becomes apparent that the collision of the edge is not entirely solid and Donkey Kong will pass through and die, as seen in the footage.

While this would not be noticeable in other places in the game, the fact that this platform is specifically meant to be reached by gliding means that this has a high chance of happening organically during regular gameplay, and has in fact been encountered by many players.

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The famous Gangplank Galleon theme from Donkey Kong Country, used later in many different arrangements and remixes as King K. Rool’s theme, is actually loosely based on the title theme from Pirates! for the NES, also developed by Rare, which David Wise composed in 1991 (3 years prior to Donkey Kong Country).

In this post, the Pirates! theme plays for the first 31 seconds, followed by the beginning of Gangplank Galleon.

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In the beginning of Mario & Luigi: Superstar Saga, a scripted battle against Bowser takes place. Bowser has so few HP and Mario has enough and takes so little damage that even if he misses all dodges and does not perform any Action Commands, Bowser still loses before Mario can die.

However, modifying the game to reduce Mario’s HP before the battle starts reveals that the game simply does not expect Mario to lose and as such has absolutely no plan on what to do if he does. Should Mario run out of HP, he will simply fall to the ground, but the battle will not end. Instead, Bowser will simply stand around forever (with Luigi watching the scene) until the game is reset.

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Officially licensed 2001 “Who’s That Character? It’s Boo” Mario Party 2 collectible card from Japan. This card provides the highest known quality of that game’s official Boo art currently known.

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Unused starry world map found in development files of Super Mario World. Curiously, this world map features absolutely no levels (looking more like a level background), and was likely only used as a placeholder, though it is unusually artistic for something designed for that purpose.

The stars create the same slightly tilted mushroom outline that was used for the earliest iteration of the game’s world map, seen in some pre-release screenshots.

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In Super Mario Bros. 2, thrown enemies or items become glitched if the player character is hurt while they are flying through the air or ground.

This can be used to defeat the Clawgrip boss with a single rock, when he would normally take five hits to defeat. If the player character throws a rock at the right wall and then touches Clawgrip in the manner shown in the footage, the rock will become glitched and emerge from the ground underneath Clawgrip, continuously hurting him until he dies.

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Unique two-page spread from a 1994 Japanese Mario character guide, dedicated entirely to artwork of characters from the back. Some of this artwork is unique to this page and has never been published in any other context.

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According to a 2021 interview with former Retro Studios developer Bryan Walker, who served as Senior Development Director on Donkey Kong Country Returns, Shigeru Miyamoto spent his initial meeting with Retro Studios to discuss the vision for the game talking in Japanese as usual.

However, at the end, he said one line in English: “Please take care of DK. He is my friend.”

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