In Donkey Kong Bananza, what collectible upgrades Donkey Kong's abilities?

Banandium Gems are the collectibles that upgrade Donkey Kong’s abilities in Donkey Kong Bananza.

These golden, banana-shaped diamonds are gathered throughout the game’s underground world. Donkey Kong earns them by exploring destructible environments, completing missions, solving puzzles, defeating enemies, and clearing optional challenge areas. They are then spent in a skill tree to improve his capabilities.

The upgrade system makes Banandium Gems more than ordinary collectibles. Progression can strengthen Donkey Kong’s movement and combat options while encouraging players to investigate side paths and hidden sections of each layer. The game contains hundreds of tracked unique gems, with additional gems obtainable through related activities.

Several other Nintendo collectibles can cause confusion. Golden Bananas are strongly associated with earlier Donkey Kong games, Kremkoins belong to Donkey Kong Country 2, and Power Moons are the main collectible in Super Mario Odyssey. Banandium Gems are specific to Bananza and its mining-themed adventure.