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Skewers (also known as Spikes and Spike Pillars) are gray, blue, black or green metallic pillars with spikes on them, serving as major, indestructible course obstacles. They primarily appear in castle and fortress levels, usually later in the game, with some exceptions. First appearing in Super Mario World, their attack patterns are moving in a single direction, either vertically or horizontally, and they can either power-down Mario if they touch him or crush him for an instant life loss. In Super Mario World: Super Mario Advance 2 and later titles, however, the Skewers can only power-down Mario. Unlike some other obstacles of the same manner, Mario can run through them if he is invincible or is undergoing post-damage invincibility frames.