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Super Mario series
Super Mario Bros. 3
A P Door first appears in Super Mario Bros. 3 in the second fortress of Giant Land. This P Door is invisible, and an outline of Silver Coins will show where to enter when the P Switch is pressed. P Doors also appeared in later fortresses including World 7-Fortress 1 and World 8-Fortress, this time in visible form, represented as a white rectangular doorway.
Super Mario World
Super Mario Maker / Super Mario Maker for Nintendo 3DS
In Super Mario Maker, P Doors were introduced in the version 1.30 update. They were given new sprites for all styles, in the same blue as the P Switches with a white or blue "P". Unlike in Super Mario World, they are visible as outlines when not active.
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