Features floor or other platforms that disappear and possibly re-appear for one reason or other (commonly from being stepped on).
Alternate names: Disappearing floor, Crumbling floor
The first video game about Disappearing platforms was released in 1983.
These may disappear when the player steps on them or they may repeatedly disappear and re-appear regardless of player interacting with them. Such as a platform that folds to the wall and then folds back out, and repeats that motion. Alternatively it could be a flexible surface that can't support the player character's weight (and thus bends down with it) but rebounds back to original position once any weight on it has been removed.