Flipper

Flippers, also known as one-way gates, are bars that, once passed through, prevent access to the area before. They resemble flippers. A Yoshi can open them temporarily if he jumps on them.

Debuting in Super Mario World 2: Yoshi's Island, flippers show up again in Super Mario Advance 4: Super Mario Bros. 3 in the following World-e levels: Slidin' the Slopes, Doors o' Plenty, Swinging Bars of Doom, Sea to Sky, Puzzling Pipe Maze, and Treacherous Halls. In this game, they are colored yellow.

A similar type of flipper appears in New Super Mario Bros. in World 2-3 only. These flippers are wooden with red arrows on them indicating which way they open to, and they are usually found individually rather than in pairs. Flippers exist unused in New Super Mario Bros. Wii; however, they reappear in New Super Mario Bros. 2 in a few levels.

Flippers reappear in Yoshi's Woolly World, serving the same function as in previous Yoshi games.