The Exploration Kit is an assortment of treasures, namely the Explorer's Friend Series. These aid the player by giving Olimar and his companion new abilities, such as running faster and lighting up the surroundings in caves. The treasures from the Kit are held by the bosses of each cave, with the exception of the Brute Knuckles, which are held by a Mamuta. The Frontier Cavern therefore has two upgrading treasures. The three caves in the Wistful Wild do not have any of these special treasures. However, obtaining the King of Bugs does unlock Louie's Notes.