Current

Currents  appear in a few games as obstacles. While currents cannot hurt the player, they can push the player away or send them into a pit.

Wario Land 3
In Wario Land 3, a current appears in Bank of the Wild River, specifically in the battle with Pesce. Wario must feed Pesce three pieces of rancid cheese to plug up the source of the water current, granting him access to the green treasure chest in the level.

New Super Mario Bros.
Currents appear in New Super Mario Bros. as obstacles protruding from Warp Pipes in water-based levels that push the player in the direction of the bubbles. Some levels feature currents that can be turned off if the player presses a ? Switch.

New Super Mario Bros. Wii
Currents return in New Super Mario Bros. Wii, behaving exactly the same as in New Super Mario Bros.

New Super Mario Bros. 2
Currents reappear in New Super Mario Bros. 2 behaving the same as in past games. In this game, currents are no longer limited to protruding from Warp Pipes, with some naturally occurring as well, such as the downwards current featured in the location of World 1-5's second Star Coin.

New Super Mario Bros. U / New Super Luigi U
Currents are featured again in New Super Mario Bros. U and New Super Luigi U, behaving identical to previous games. Like with New Super Mario Bros. 2, some currents occur naturally, such as the returning downwards currents featured in Tropical Refresher and Urchin Reef Romp.

Mario Kart 7
In Mario Kart 7, currents appear as obstacles that push racers around in Wario Shipyard and Piranha Plant Slide. In the case of the latter, one such current allows the player to access the Dash Panel over the last Piranha Plant before the Glide Ramp.

Mario Kart 8 / Mario Kart 8 Deluxe
Currents return in Mario Kart 8 and Mario Kart 8 Deluxe, behaving the same as in Mario Kart 7. They appear in Dolphin Shoals and 3DS Piranha Plant Slide.

Donkey Kong Country: Tropical Freeze
Currents also appear as obstacles in Donkey Kong Country: Tropical Freeze, where they are featured in some underwater levels. They are most prominently featured in Current Capers, where some currents in the level expand and contract.

Mario Party 10
Currents appear in Mario Party 10, in the minigame Blooper Blastoff. If interacted with, they push away the player's Blooper submarine.