Grinder

Grinders are metal disc found only in fortresses.There are two types;those line-giuded and those without.The line-guided grinders travel along a dotted line while the non line- guided travel across the floor.Those blades are rather large and cannot be jumped on and can only be defeated by sliding into them,Which creates a glitch symbol.Mario can, however, spin jump from them for extra height..They Appeared only in Super Mario World.