Shadow Cap

The Shadow Cap is a cap that appears in certain personalized copies of Super Mario 64. It allows the player to interact with shadows in the level, such as enemies that are only seen as shadows and invisible platforms. It may have inspired the Shadow Alley level in Super Mario 3D World, seeing as the similarities between the Shadow Cap and Shadow Alley.

Shadow Cap In The Shady Sands
Shadow Cap in the Shady Sands is the cap switch course for the Shadow Cap, found in the Castle Crawlspace, specifically in a shadow of a painting in the Peach's Art Gallery area. It is a large desert with several shadows. The player must use the Shadow Cap to platform on top of shadows to reach the top of a large dune. The Cap Switch on top of the dune is invisible except for the base and exclamation mark, though it is reflected in shadows, fitting with the theme.