P-Meter

The P-Meter, also known as the Power Meter, is a type of meter first seen in Super Mario Bros. 3. For it to fill up, Mario (or Luigi) must keep running without stopping. Once the Power Meter is fully charged and the "P" icon starts flashing, Mario can run at full speed. If Mario is Raccoon Mario or Tanooki Mario, he will also have the ability to fly if the Power Meter is full. However, in those two forms, the Power Meter will always empty itself after a while. If Mario is flying, he stops and descends; otherwise, he slows down. It will also empty itself if Mario crouches, turns around, or runs into a wall, though it stays full if Mario jumps while running while he is not Raccoon or Tanooki Mario. If Mario uses a Magic Wing before entering a level, the Power Meter is full for the rest of the stage or until Mario takes damage, grabs a non-flight-based power-up, or loses a life, meaning Mario can fly for an unlimited amount of time.

In the Super Mario All-Stars and Game Boy Advance versions of Super Mario Bros. 3, instead of its original black-and-white appearance, the Power Meter is colored orange when filled up, and the "P" icon flashes red. In the latter port, the Power Meter stays full if Mario keeps running, even in Raccoon or Tanooki form, meaning that Mario can extend his flight time by landing and taking off again while the "P" icon flashes. It also beeps in a lower pitch if Mario is not in those two forms. It can be halved by the Cyan Switch, and Power Meter Blocks make it charge faster.

The P-Meter returns in New Super Mario Bros. 2, appearing only when Mario is Raccoon Mario (or White Raccoon Mario), with a few visual changes. The "P" icon is replaced by a red-outlined P-Wing icon (which flashes golden), the meter itself is colored red when filled up, and the meter visually empties as Mario flies, unlike in Super Mario Bros. 3, where the meter looks full until Mario stops flying. Aesthetics aside, the P-Meter works as it did in Super Mario Advance 4, though the White Raccoon form makes it charge faster.

The P-Meter returns in Super Mario Maker, Super Mario Maker for Nintendo 3DS, and Super Mario Maker 2, but it appears only in the Super Mario Bros. 3 style, working as it did in that game. In the version 3.0.0 update of Super Mario Maker 2, if Frog Mario is holding an object, he will have the ability to run on water if the P-Meter is full.