Super Acorn

The Super Acorn is a power-up item that debuted in New Super Mario Bros. U. It also appears in New Super Luigi U and New Super Mario Bros. U Deluxe. The item resembles an acorn with red and yellow stripes on top and a red face with eyes on the bottom. It transforms anybody who touches it into the Flying Squirrel form, gaining puffy overalls, a grayish shirt and shoes, and a large cap featuring two squirrel ears and a beige brim. Characters in this form also receive a tail and two gray membranes underneath their arms. They also gain the ability to lightly glide in a similar way to the Raccoon, Cape or Bunny forms as well as the ability to cling to walls and air jump while gliding. This item seems to grow from a large Acorn Tree in Acorn Plains.

There are some Super Acorns rolling around in some parts of the world map, where they can be collected instantly and stored into the inventory.

New Super Mario Bros. U Deluxe

 * North American website bio: "This power-up will make you look like a flying squirrel-and glide like one, too!"
 * European website bio: "This nifty nut transforms your heroes into Flying Squirrels, granting them the gift of graceful gliding! They can even grab onto walls for a brief time, making this one potent power-up!"

Trivia

 * In the Super Mario Mash-Up Pack for Minecraft, Cocoa Beans are replaced by Super Acorns.