Niko (on Tumblr)

Super Mario World concept art only ever shown once, extremely briefly, during a montage in the September 2025 Nintendo Direct, while the camera was panning across it. Here is the artwork stitched together from all frames showing it, at the highest resolution available from the video.

Source: LadySophie17

Officially licensed 1989 sweatshirt themed after Mario's overalls. Note that the area to the left and right of the suspenders is miscolored, creating red segments on the "shirt" portion that is supposed to be blue.

This is likely due to the manufacturing process; doing this allows for the middle portion to be made out of mostly red fabric with only a single blue segment in the middle, and the back of it to be entirely red, while doing it the "correct" way would have required additional blue segments on the back as well.

The original storyboards for the North American 2010 commercial for Super Mario Galaxy 2 contain a piece of Super Mario Bros. fan art from DeviantArt.

Top: the storyboards, recovered from internal files of the ad agency. Middle: zooming in on the frame with the TV reveals an image of Super Mario Bros. in 3D. Bottom: this is the 2008 fan art "Nintendo 3D Mario" by DeviantArt user "NES--still-the-best", which was extremely popular and commonly reposted online at that time.

Source: discovery, original artwork

Comparison between the model for the cage containing the entrance to Big Boo's Haunt between Super Mario 64 (left side) and Super Mario 64 DS (right side).

In both cases, the two buildings inside the cage are actually modeled, which is extremely difficult to see in the games (particularly for the shed), but the way in which they are modeled differs between the versions. The Super Mario 64 version has less details but more authentic textures, while the Super Mario 64 DS version adds windows to the mansion but makes the buildings look much more primitive.

Source: MrGameAndSketch, Peardian

Players of Super Mario Advance may recall that one of the major changes in that game compared to the Super Mario All-Stars version of Super Mario Bros. 2 (on which it is mostly based) is the inclusion of two new boss intros for Fryguy and Clawgrip, respectively.

In both cases, the action stops and a cutscene shows four bubbles (identical to Wart's bubble attack) float up from the bottom of the screen and surround an entity before transforming it into the boss (a mask for Fryguy and a small Sidestepper crab for Clawgrip).

The game actually contains two unused scenes for the same intro happening with two more bosses: Mouser and Tryclyde, shown restored in the footage. Mouser is created from a unique small mouse sprite, while Tryclyde is created from a Cobrat.

This implies that during the game's development the idea of Wart's magic being responsible for most of the game's bosses was more prevalent, before these scenes were scrapped for an unknown reason.

Source: AkiraTheGamer

Pedestrian traffic lights