The Battle Fortress (バトルクック Batorukukku?, lit. "Battle Kukku") is the final area of Tails Adventure. It is the Battle Kukku Empire's main base of operations. It was first seen as an inconspicuous small landmass known as Coco Island (クックとう Kukku-tō?, lit. "Kukku Island"), but after Tails stormed the island it floated out of the waters to reveal its larger true form. After the leader was defeated in combat, it began to explode and sunk into the water.