Inverted Pyramid Skip
Inverted Pyramid Skip (often shortened to IP Skip or Pyramid Skip) is a trick discovered by Mnyush that allows the entire interior of the Inverted Pyramid in the Sand Kingdom to be skipped. It involves scaling the outside of the pyramid up to the exterior of the 2D section, then performing a difficult midair corner clip to clip out of bounds in order to climb all the way to the top.
Because the Hariet boss fight at the top of the pyramid will trigger before collecting either of the previous two Story Moons, this trick can be performed before even completing any other story objectives in the kingdom. It is a faster alternative to Inverted Pyramid Clip.
Uses
Speedrunning
Because Inverted Pyramid Skip allows the interior of the pyramid to be skipped entirely (which has multiple slow 2D sections), it saves upwards of half a minute in multiple speedrun categories. The time saved depends on how many Power Moons would otherwise be collected inside the pyramid, since those moons will need to be replaced elsewhere within the route.
Minimum Jumps
Inverted Pyramid Skip is useful in Minimum Jumps, as it is the only way to reach the top of the pyramid without jumping (the 2D sections that comprise the interior of the pyramid require multiple jumps to traverse). The skip is more difficult without the ability to jump, and involves using two-player mode to perform instantaneous vaults.