The Key

The Key is a treasure in Pikmin 2, whose name is the only one among the treasures that describes itself exactly. It is a large, golden. The Key is found inside the body of a Beady Long Legs on the last sublevel (5) of the Citadel of Spiders. Besides increasing the Poko total, The Key unlocks Challenge Mode, which can be found in the main menu after the treasure has been collected. It is the only part of the Explorer's Friend Series that is not found in the Exploration Kit.

In Pikmin 2 Challenge Mode, this treasure is found on every sublevel of every one of the 30 levels. It is required to make the entrance to the next sublevel – or a geyser – appear, and is worth 100 Pokos.

Trivia

 * The Key bears a striking resemblance to the keys in Super Mario Bros. 2, which are guarded by Phanto masks, or the keys in Super Mario World, which open keyholes leading to secret stages.
 * Perhaps erroneously, Olimar calls the Beady Long Legs a "Pikmin-devouring spider", even though the creature does not eat Pikmin.
 * Two unused upgrades in Pikmin 3 feature The Key on a pedestal.