Lance

Yari are blade obstacles that rest in one place, usually along the ceiling, thrusting up and down in a set rhythm. They usually are deployed in narrow places with not much room for evasion to ensure difficulty for the player to progress. Functionally, they are comparable to Skewers, albeit much smaller than they usually are.

Super Mario Land 2: 6 Golden Coins
In Super Mario Land 2: 6 Golden Coins, yari appear in Turtle Zone, looking like a simple long, thin knife. There are less of them in Easy Mode.

Wario Land: Super Mario Land 3
In Wario Land: Super Mario Land 3, yari appear in Syrup Castle. They appear as low-hanging, axe-like blades that constantly jiggle up and down, though their collision remains approximately block-sized. Small Wario can simply walk underneath them, but if larger, Wario will have to crouch and crawl underneath them. Jet Wario can also fly through them if launched on the floor.

Wario Land II
Yari are encountered in several levels of Wario Land II. They are composed of a blade resembling the version of yari from the previous game, but are attached to a metal pole with some wire wrapped around it, and produce an alarming sound when moving. While the edged part of the yari itself can hurt Wario and throw him backward, the pole is harmless and can be passed without taking damage. Some yari even have Conveyor Belts underneath them.