Quest Items

Quest Items are a type of anomalous item that has been reported in some personalized copies of Super Mario 64. Quest Items are used to obtain Power Stars, other collectibles, or simply reach certain areas that would not be accessible otherwise. Quest Items are unique due to the fact that they can reportedly be taken out of levels to be used elsewhere, unlike a majority of other items in Super Mario 64, such as caps and coins.

General Description
Despite almost all Quest Items being very different from each other, they all seem to have some shared aspects across reports and different Quest Items. A majority of Quest Items appear to be recycled from other parts of the game, such as parts of enemies or stage hazards, potentially being created by the A.I. when it reimplements the mechanic, explaining the re-usage of assets.

Quest Items generally directly lead to some sort of collectible upon being used, instead of unlocking other levels or areas or beginning a chain of Quest Items. However, some reports claim there are multiple of the same Quest Item, or that Quest Items can be used multiple times. This "rule" appears to separate Quest Items from other anomalous items such as keys.

Quest Items are commonly obtained through ! Boxes or treasure chests, particularly the Purple ! Box. Quest Items have never been reported to be found out in the open for unknown reasons. Upon being collected, players commonly report no way of knowing they have collected the item except for the item disappearing upon being collected, until the Quest Item is used.

Commonly Reported Quest Items
''Note that these are simply the most commonly reported Quest Items as well as the most common uses of these items. Other Quest Items or Quest Items with different uses can occur.''

Bubble
The Bubble is a Quest Item with a simple usage, being used in a lava level or in an otherwise hot environment to cool down a pathway to a Power Star or other collectible. It is usually located in a water level, likely due to the nature of bubbles. Alternatively, some have reported having to take a Bubble to a Bob-omb in Bob-omb Battlefield to fuel a cannon shooting water bubbles.

Battery
The Battery is a Quest Item that can be used to power a machine in Tick Tock Clock that would emit a collectible or unlock a path to the collectible. The Battery itself can reportedly appear in Tick Tock Clock or any other area with some form of machinery inside of it, such as Wet-Dry World, potentially being removed from a mechanical enemy such as a Heave-Ho through various means.

Seed
The Seed is a Quest Item that can be planted on part of an island in Tiny-Huge Island, growing to allow the player to climb up to a Power Star or other collectible, or spawn the collectible itself, revealing it while blooming if it is a flower. The Seed is usually found in one island of Tiny-Huge Island, and is then planted in the other island. Notably, the Seed does not appear to be effected by the size difference in most reports.

Gift
The Gift is a Quest Item that can reportedly be found in any level in Super Mario 64, and must be given to a Toad in Princess Peach's Castle in order to obtain the collectible from the Toad. The Gift is noteworthy as it is the only Quest Item reported to appear in any level, as all other documented Quest Items tend to appear in specific levels, likely due to the relation to the level themes that these Quest Items have.