Semisolid platform

Semisolid platforms are a recurring type of platform in the Wario franchise, although they originate from the Super Mario series.

Wario Land series
Semisolid platforms are present throughout the Wario Land series with the same function as in other platform games, though they always have a bridge-like appearance. Many enemies that are found on semisolid platforms can be immobilized briefly by bumping into them from beneath. If Zombie Wario lands on a semisolid platform, he will disintegrate and pass through it, falling through any other semisolid platforms located below until he reaches solid ground. In Wario Land II, there are certain platforms that only enemies and objects can stand upon, but not Wario; for enemies, these function as semisolid platforms, in that Wario can throw them on top of one from beneath.

Wario: Master of Disguise
In Wario: Master of Disguise, Dragon Wario's weight causes him to fall through any semisolid platform he encounters, much like Zombie Wario in the Wario Land games.