P Warp Door

P Warp Doors (or P Doors) are Warp Doors that can only be entered when a P-Switch is active. These warp doors have made their first appearance in Super Mario World in the Donut Ghost House.

Super Mario World
In Super Mario World, P Warp Doors appeared in the level Donut Ghost House. They had the same sprite as a Warp Door, but with a light blue pallet.

Super Mario Maker
In Super Mario Maker, P-Doors were introduced in the version 1.30 update. They were given a new sprite for Super Mario Bros., Super Mario Bros. 3, Super Mario World, and New Super Mario Bros. U. The new sprite was a blue door with a white or blue "P" on it.