Mushroom

Mushrooms are the most common power-up in the Super Mario Bros. series. They primarily heal the player, though have functioned differently in some games. Several other power-ups also take the form of mushrooms, though are not considered variants of the Mushroom power-up due to few similarities.

Mushrooms have a unique mechanic in Super Mario 64 DS, functioning similarly to the Mega Mushroom. Upon being collected, it will make the player larger and allow them to destroy several objects that are otherwise indestructible. Destroying enough objects before the ability runs out rewards the player a 1-Up with every object destroyed after that.

Super Mario 64 Manifestation
Mushrooms have been reported to appear in certain personalized copies of Super Mario 64, usually healing the player if they are damaged. Notably, when Mushrooms manifest in this way, coins usually do not heal like they do in standard copies. Mushrooms can also manifest in place of 1-Ups and function the same way, or function the same way as the Super Mario 64 DS Mushrooms.

Mini Mushroom
In some personalized copies of Super Mario 64 DS, a Mini Mushroom may appear as the opposite of the regular Mushroom. As one would expect, it would make the player smaller. This usually does not have many conventional uses except for areas like Tiny-Huge Island, some say that levels can be altered to require the usage of the Mini Mushroom, such as having to use the Mini Mushroom to pass through the bars blocking off the mountain in Bob-omb Battlefield if the level is edited to not have the regular entrance.