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Original illustrations of Mario obtaining treasure from a 1988 official Japanese guide for Super Mario Bros. 3.

Original illustration of Boos from a 1988 Japanese Super Mario Bros. 3 guide.

Board game pieces for cutting out, featuring Mario, Luigi, Peach, Bowser and the Shogaku Ichinensei magazine's bowtie-wearing Yoshi design, from a 1991 issue of the magazine.

Illustrations from a 1989 Japanese guide for Super Mario Bros. 3.

Title card for an episode of Satella-Q, a 1997 quiz show broadcast over the Satellaview add-on for the Super Famicom in Japan. Note Toad's unique catlike mouth as he is sleeping.

Cover of "Mario's Adventure Land", an officially licensed 1999 Mario adventure book that uniquely includes elements of several different titles instead of being based on a single game. The games referenced include Super Mario 64, Mario Party, Yoshi's Story, Wario Land 2, and even Diddy Kong Racing.

Super Mario Sunshine contains an unused enemy called "Dorokuri", which is a wingless version of the Swipin' Stu enemies found on Pinna Park Beach in the finished game. As such, they have the same ability to steal the cap from Mario's head.

However, in addition to this, they also have the ability to steal Mario's cap from each other, resulting in the humorous bouncing animation seen in the footage where the two Dorokuri keep taking it from each other whenever they touch.

Mario Kart Wii contains a bizarre error on the Mario Circuit track whereby the shadow of one of the houses has the chimney on the wrong side (note how the house has the chimney on the right while the shadow's chimney is on the left).

This would obviously be impossible with modern games' lighting engines that create real shadows based on the actual shapes of objects and light direction, and is only possible due to the game using premade textures covering the ground as a low-tech alternative to actual shadows.

It is likely the texture was made when the house was facing the other direction, and not updated when it was rotated or mirrored.

sweet as a 1/4th cup of sugar Some extras below the cut!