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A Grinder is a spinning metal saw blade that acts as a hazard in several Mario games.
Super Mario series
Super Mario World
Grinders make their debut in Super Mario World, and are found in some Fortresses and Castles. In this game, there are two types of Grinders: line-guided and non-line-guided. The line-guided variety travels along a dotted line while non-line-guided Grinders travel across the floor. The blades are rather large and cannot be jumped on, although they can be defeated by a Slope Slide (which displays a glitchy sprite). Mario or Luigi can also Spin Jump onto a Grinder, which lets them bounce off it without taking any damage.
Super Mario Galaxy 2
In Super Mario Galaxy 2, Grinders (referred to as "buzz saws" in the Prima guide) appear in the Puzzle Plank Galaxy and the Rolling Masterpiece Galaxy, where they cut through planks of wood and cause them to fall. When Mario traverses certain parts of a planet or comes close to a Grinder, it starts moving and any enemy that touches it is defeated. Mini Garigari also appear in the game.
Super Mario 3D Land
New Super Mario Bros. 2
Grinders appear in New Super Mario Bros. 2, where they operate on tracks as they did in Super Mario World. They can also jump vertically, if the tracks allows them to. They are among the few obstacles in the game that cannot be destroyed by Gold Mario's fireballs. Big Grinders also appear in the game.
Super Mario Maker / Super Mario Maker for Nintendo 3DS / Super Mario Maker 2
Grinders reappear in Super Mario Maker, Super Mario Maker for Nintendo 3DS and Super Mario Maker 2. Their appearance is larger and different than that of previous titles. Because Grinders did not appear in Super Mario Bros. and Super Mario Bros. 3, new sprites were made for those styles, and the New Super Mario Bros. 2 model is reused for the New Super Mario Bros. U style, though a different sprite was created for the Super Mario World style instead of reusing the original sprite. They also cannot be Spin Jumped on and are invincible, though they can be jumped on using Yoshi or a Goomba's Shoe. Grinders in this game remain floating in place instead of spinning right and left if not connected to a track.
The version 1.30 update allows the player to shake the Grinder, turning it into a Bumper. The Bumper will simply cause Mario to bounce off it, and nothing else.
Super Mario Run
Grinders reappear in Yoshi's Story. They are found abundantly in Mecha Castle and Lift Castle, and reappear in Magma Castle in tight spaces. Some Grinders are permanently connected to walls and need to be jumped or crawled past.
Paper Mario: Sticker Star
Super Smash Bros. series
Mario & Luigi: Paper Jam
Names in other languages