Vesper

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Vesper ✪ they/them ✪ 24 ✪ may contain Brothership spoilers! #1 lesbian Ten truther I'm also @fullmoonfireball on tumblr!

Mario & Luigi: Superstar Saga contains a "Spanish Peach Protection" exploit. Normally, Peach gets kidnapped in a cutscene when Mario is distracted by Toadsworth. Setting the language to Spanish helps mash through Toadsworth's text so fast that Peach never actually gets kidnapped.

In Paper Mario: The Thousand-Year Door, each Shine Sprite can be collected twice because the icon of it appearing is not merely visual, but literally another Shine Sprite. This provides a cautionary tale to developers about never implementing a visual effect as a copy of the object itself.

For fans of special challenges, the final Bowser battle in New Super Mario Bros. U presents the "Defeat Bowser By Throwing His Son At Him Challenge". Normally Bowser dies after 3 hits with the Clown Car. However, the player can also throw Bowser Jr. at Bowser NINETY times to win.

In the final battle of New Super Mario Bros. U, the intended method to damage Bowser is Bowser Jr.'s Junior Clown Car.
After knocking Bowser Jr. out of the Clown Car, Mario can ride it into the air above Bowser...
...and perform a spin down onto him. It takes three hits to defeat Bowser in this way.
However, if Mario stomps Bowser Jr. while he is running back to the Clown Car after being knocked out...
...he will retreat into his shell, which Mario can pick up.
Mario can then throw Bowser Jr. at Bowser...
...which does not even seem to do anything to Bowser except briefly redden the area of impact.
Yet, this does actually deal damage to Bowser... being 1.12% of his health. Bowser will die after being hit NINETY TIMES with Bowser Jr.'s shell, making this an extremely time-consuming way to win this battle.
...even more so than hitting him with fireballs, which takes 180 hits but at least does not have a cooldown like Bowser Jr. has.
Source: YouTube user @SmashyYT, youtube.com/watch?v=VaBpa6oWQ58; additional images by Supper Mario Broth

In World 8-7 of New Super Mario Bros. Wii, releasing a mushroom on the third Spine Coaster but not collecting it results in an entertaining interaction whereby the Spine Coaster will balance the mushroom on its nose, like a seal trained to balance a ball.

In Mario Kart: Double Dash, shadows in the environment do not follow any kind of lighting logic and appear to have been placed solely based on "vibe". This results in shadows being cast in nearly every possible direction at the same time.

A picture of Dry Dry Desert from Mario Kart: Double Dash with shadows marked. The shadows go in a variety of different directions at different points in the map despite there being only one light source.
Source: info: Peardian (bsky.app/profile/peardian.bsky.social), noclip.website

In Paper Mario, Bowser claims that the Star Rod makes him invincible. However, in the first battle, it merely raises his Defense to a measly 1. If Mario is given just slightly better shoes, he can get through the protection. Bowser cannot handle taking over 10 damage, making the game crash.