Poison tide

Poison Tide is a type of harmful hazard where poison moves up or down in the Super Mario franchise.

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 super quick and falls gradually.

Super Mario Maker 2
In Super Mario Maker 2, the player can set the level and change the speed of Poison Tides.

Captain Toad: Treasure Tracker
In Captain Toad: Treasure Tracker, Poison Tides only appear in Ghost Gallery Gambit where it rises up constantly.