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Cogs (also known as gears) are obstacles in some Mario platformers. They have the ability to push the player off if one tries to climb one.
Yoshi's Crafted World
Cogs reappear in Yoshi's Crafted World in Mr. Geary's Factory, behaving as they do in the New Super Mario Bros. games. Additionally, an animate cog known as Mr. Geary is fought at the end of said level.
Super Mario series
New Super Mario Bros. Wii
In New Super Mario Bros. Wii, cogs can be found in World 1-. If the player remains under one, they are squished and lose a life. The player is required to platform across them to reach the boss door. Additionally, cog-like wheels can be found in World 6-.
New Super Mario Bros. U
New Super Luigi U