DigiCube Co., Ltd.(株式会社デジキューブ, Kabushiki-gaisha Dejikyūbu?) were a subsidiary of Square used to publish books, music, and other merchandise. They also acted as a distributor of other non-game related media. After merging with Enix (also a publisher of books with Gangan Comics), Square Enix shut DigiCube down later that year. Square Enix's current works are now published under "Square Enix" (see Square Enix Music and Square Enix Magazine & Book).
Prior to DigiCube, Square Enix had their guide books handled by other companies such as NTT Publishing and Famitsu.
A series edited by Studio BentStuff, DigiCube published the first 12 volumes before going bust. Square Enix re-published them all (except the superceded Kingdom Hearts Ultimania) and continued publishing more.
Are two-issue volume was made for the first six games (the only released at the time). In 2002, these issues were revised, and a second volume covering the four games released since the first was released.