Chestnut

s are a type of tree fruit know for their hard, spiny s containing the edible seed portion. In the extended Mario franchise, chestnut shells occasionally appear as obstacles.

Wario Land 3
In Wario Land 3, chestnuts are conjured up by Wolfenboss, bouncing on the ground when they land. They break open after a few moments, letting the Kuri inside free, then disappear. If Wario touches one, he turns into Puffy Wario, evicting him from the battle.

Donkey Kong Jungle Beat
In Donkey Kong Jungle Beat, red chestnuts are used as harmful projectiles by Coco Pigs and both types of Mini Slump Bird. Unlike coconuts, they cannot be knocked back at the enemy. In Aurora Glacier, Coco Pigs instead throw smooth ice balls, though these are made spiky as well in New Play Control! Donkey Kong Jungle Beat.

Super Mario series
In New Super Mario Bros. Wii, New Super Mario Bros. U, New Super Luigi U, and New Super Mario Bros. U Deluxe, chestnut shells are used as armor by Prickly Goombas. They hurt anyone except Yoshi that tries to jump on them, but can be burned away by a fireball.