Poison tide

Poison tides are a type of hazard in the Super Mario franchise that moves up and down.

New Super Mario Bros. 2
Poison tides debut in New Super Mario Bros. 2, only appearing in the Third Course of the Impossible Pack in Coin Rush. It rises quickly and falls gradually.

Super Mario Maker 2
In Super Mario Maker 2, the player can set the level and speed of poison tides.

Captain Toad: Treasure Tracker
In Captain Toad: Treasure Tracker, poison tide only appears in Ghost Gallery Gambit where it rises up constantly.