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Super Mario series
Super Mario Bros. 2
Super Mario 64 / Super Mario 64 DS
Super Mario Advance 4: Super Mario Bros. 3
Super Mario Galaxy
Key Doors appear in the Ghostly Galaxy in Super Mario Galaxy, where they automatically open as soon as Mario or Luigi obtains a key. In the case of the galaxy's mission "Matter Splatter Mansion", multiple Key Doors can be unlocked at once with one key.
Super Mario Maker / Super Mario Maker for Nintendo 3DS
Super Mario RunSuper Mario Run in the level Boohind Lock and Key, where they can only be opened with keys. The keys are often found in either Blocks or Boos and, once entered, cannot be entered again. Key Doors resemble Ghost House doors from New Super Mario Bros. U, but with a keyhole in the center.
Captain Toad: Treasure Tracker
Key Doors appear again in Captain Toad: Treasure Tracker, behaving like in previous Mario games.
Super Mario Maker
Names in other languages