1
According to the manual for Mario Party, Luigi is smarter than Mario.
2
In Luigi's Mansion, after scanning the dresses in the Wardrobe Room, Luigi briefly considers wearing them before deciding against it.
3
Concept art of unused expressions for several characters in Mario Strikers Charged.
4
Mario Party 7 (2005) has had the highest-resolution Toad mouth texture to date, even higher than Captain Toad: Treasure Tracker (2014).
5
According to the Nintendo Power DKC2 trading cards, Donkey Kong's favorite quote is "I have but 99 lives to give for my Country".
6
During the tutorial in WarioWare: D.I.Y., Wario continuously offers to assist the player. Here is his attempt to draw a circle.
7
Promotional screenshots of PictoChat for the Nintendo DS, featuring a sample conversation about Mario.
8
Toad from a Spanish print ad for Super Mario Bros. 3.
9
Comparison of Mario's and Luigi's skulls from Super Mario Galaxy.
10
Shy Guy eating a bomb from a Valiant Nintendo Comics System comic. This is one of the few times Shy Guy's teeth are visible.
11
In January, I restored the presumed lost Big Yoshi art from Super Mario RPG (left). Now, a full official version has finally been found.
12
King Boo from Mario & Luigi: Paper Jam and Big Boo from Mario Pinball Land with their mouths closed in a manner uncommon for Boos.
13
Repeatedly refusing to buy information from the info vendor in Mario & Luigi: Superstar Saga will cause the game to glitch and freeze.
14
In Super Mario World, Mario has special tilted sprites that are visible for one frame when he is running up a Triangle Block.
15
Shadow clones from Mario & Sonic at the Sochi 2014 Olympic Winter Games. Shadow the Hedgehog's clone is called "Shadow Shadow".
16
Officially licensed Mario Kart 64 T-Shirt.
17
NES cartridge containing a prototype version of Super Mario Bros. 2, for company-internal use by Nintendo.
18
Completely false Super Mario Bros. tip submitted by readers and published in Nintendo Fun Club News, an official Nintendo publication.
19
Boo stress ball available as a preorder bonus for Luigi's Mansion: Dark Moon exclusively in the United Kingdom.
20
During the introduction scene of the Apes of Wrath minigame in Mario Party 7, Mario's eyes become misaligned for several frames.
21
Sue from Cave Story+ dressed as Princess Peach for the Halloween event.
22
Whenever Wario uses a Super Mushroom in Super Mario 64 DS, his chin clips inside his torso.
24
Comparison of the sprites used when Luigi takes a photo in Mario is Missing. Left: SNES version, right: PC version.
25
Chalkboard drawings of Yoshi seen in message boxes from Yoshi's Island, including those found in the data but not used in the game.
Additional obscure Mario content for suppermariobroth.com.
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