Inaccessible Level Painting

The Inaccessible Level Painting is a supposed painting in a room in some personalized copies of Super Mario 64. It appears as a greyscale version of the Rocky Mountain painting in a greyscale version of the Bob-omb Battlefield room. Notably, there are 2 red dots on the painting, contrasting with the greyscale painting. Notably, Mario is also greyscale, meaning that this room could have actually been colored and the image was edited. The painting cannot be entered, though it has been documented to make a sound when jumped to.

The way to access the room containing the Inaccessible Level Painting is inconsistent, though the most common way is standing on every pillar in the Mirror Room in a specific order, which will make the mirror lower and allow the player to enter the door on the other side of the mirror. The door will lead to the room with the Inaccessible Level Painting.

Theorizing
It is believed that the Inaccessible Level Painting is a corrupted version of the Rocky Mountain painting that went on to be replaced by Whomp's Fortress, with the painting appearing in place of Bob-omb Battlefield likely due the Personalization A.I. reusing the room. However, why the painting is inaccessible is unknown, possibly due to the Personalization A.I. being unable to make a level for it.