Big Star Door
From the Super Mario Wiki, the Mario encyclopedia
Big Star Doors are a special sliding type of ★ door in Super Mario 64 and its remake, Super Mario 64 DS. Like other ★ doors, they restrict progress to certain parts of the Mushroom Castle until the player has the necessary number of Power Stars. Unlike normal ★ doors, however, they cover passages that are always required to open to complete the game. In the remake, only Mario can unlock a Big Star Door, but once it is unlocked, any character can enter it.
Four Big Star Doors exist in the games:
In the Super Mario Mash-Up Pack in Minecraft, there is a painting of a Big Star Door.