Warp Door - Super Mario Wiki, the Mario encyclopedia

Warp Doors are objects appearing in several Super Mario series titles that take Mario, Luigi, or another character to another part of the level. Most of them are unlocked, while some, known as Key Doors, require a key to be opened. Some games feature P Warp Doors, which are blue doors

Donkey Kong - Super Mario Wiki, the Mario encyclopedia

Super Mario Adventures, Party Ninja Wiki

Super Mario 3D Land, MarioWiki

P Warp Door, MarioWiki

Propeller Mario - Super Mario Wiki, the Mario encyclopedia

User blog:IncidentalSeventy/Super Mario Bros. 2 (Video Game Review), Encyclopedia SpongeBobia

Star Objects - Giant Bomb

New Super Mario Bros. Wii, Ultimate gaming Wiki

Super Mario Bros. 35th Anniversary - Wikipedia

Super Mario RPG (Nintendo Switch) - Super Mario Wiki, the Mario encyclopedia

Paper Mario, Nintendo

Super Mario Maker 2, Nintendo