Kensington's Chamber

Kensington's Chamber is allegedly a hidden stage found in certain personalized copies of Super Mario 64. It is said to occasionally replace the Tall, Tall Mountain painting in the second floor of the castle.

Overview
Kensington's Chamber is said to simply be a blue platform floating above a deathplane, with the skybox sharing that of Bowser in the Dark World's. When Mario lands on the platform, a Goomba in a blue top hat can be seen on the other side, as well as a curly mustache. Once Mario lands, a textbox opens up.

"Hey."

The Goomba then plays an animation of itself loading a golden gun before shooting Mario. This bullet is unavoidable, though it takes a few seconds for the Goomba to fire. When Mario is hit by the bullet, he is instantly killed, being launched out of the painting.

Missions

 * 1) THE MISCHEVIOUS BOSS
 * 2) GET THE GOLDEN GUN
 * 3) KENSINGTON STRIKES BACK
 * 4) WHERE TO LOOK (Yet to be collected by a player)
 * 5) RED COIN STAR (Presumably)
 * 6) UNKNOWN
 * 7) 100 COIN STAR (Presumably)

THE MISCHEVIOUS BOSS
In this star, Mario must quickly either punch or jump on the Goomba before it shoots him. Once this is done, it will explode into a Star, which Mario can collect

GET THE GOLDEN GUN
A simple star. It works the same as the previous star, except when Mario defeats the Goomba, it throws it's golden gun in an arc in a random direction. If it were to land on the deathplane, this star will be unobtainable. If Mario were to touch the gun, it will fire out a Star which he can collect.

KENSINGTON STRIKES BACK
Works the exact same as The Mischievous Boss, but the Goomba fires it's gun somewhat faster.

WHERE TO LOOK
As of 10/29/20, this star has yet to btie obtained, as even defeating the Goomba reveals no star.

Trivia

 * Interestingly, in the 2020 game The Henry Stickmin Collection, during the 'Special BROvert Ops' route in Completing the Mission, if the player were to choose the 'Painting Portal' option, the player, Henry Stickmin, will be warped to the exact area. The Goomba was redesigned to fit the world, now being a stickfigure, but he still works the same. It is very likely that the creator of the game, PuffballsUnited's, copy of Super Mario 64 was personalized, though this is unconfirmed.
 * Henry in the Dark World.JPG.jpg top of that, Henry is shown to have 0 stars when he enters Kensington's Chamber, despite the fact that this would be impossible in the actual game. This may be a simple oversight.