Speedflip

A speedflip is a glitch that allows the player to gain an arbitrary amount of speed. In the direction perpendicular to a sideflip, Mario's speed is not capped, meaning one can, under the right conditions, build up infinite speed in this direction. Mario's acceleration in this direction is proportional to the component of the left joystick pointing in that direction, with a maximum acceleration of 0.075 units/frame².

Mario's speed in the direction of the sideflip and his speed perpendicular to the sideflip are completely independent. This makes it possible to vector a speedflip, squeezing out just slightly more speed (though the acceleration is unaffected).

Pedro spots

A Pedro spot is a location in which Mario can remain in the falling animation without actually descending, which allows him to build up speed with a speedflip while remaining still. For a location to work as a Pedro spot, it must have a way for Mario to maintain the falling animation next to a wall. For example, in a spot with a wall parallel to and very close to a slope that's too steep for Mario to stand on, the wall will push Mario into the slope, and the slope will push Mario back into the wall, without Mario reverting to standing. The whirlwinds in Snow Kingdom can also work as Pedro spots. The name "Pedro spot" was borrowed from a similar glitch in Super Mario 64.

Location	Description	Clip
Between the rolling corn and a wall in Luncheon Kingdom	If the corn is moved slightly away from the wall, it'll allow Mario to get stuck between them. Once Mario has around 120 speed, he will move up the perpendicular wall, as it has a very steep slope near the bottom. Mario will escape this spot at around 1200 speed.	Clip
A whirlwind near Luigi in Snow Kingdom	This spot is unstable, making it difficult (but not impossible) to build up significant speed. Because of its instability, it's possible to be pushed up onto the adjoining slope with a high horizontal speed, thus converting it to vertical speed.	Clip
The second highest whirlwind in Snowy Mountain	It seems that Mario won't escape this spot and can build up speed indefinitely.	Clip
Just east of the slots building in Luncheon Kingdom	Using a turnip Mario can turnip slide against the wall while speedflipping to build up to around 60 speed before escaping.	Clip

Other uses

In Minimum Captures Max Moons, a speedflip is used to get two moons in the Underground Moon Caverns. It has also been proposed to use a Pedro spot combined with nut sliding to find a new method to collect the Third Courtyard Outskirts moon in Bowser's Kingdom that doesn't involve Nut jumping, thus proving the moon possible on versions 1.2.0 and later.

Another use of speedflipping is as a method of trickjumping from the Warp Painting island in Bowser's Kingdom to the Third Courtyard Rear island. Speedflips have also been suggested as a potential way to find a new infinite fall.