List of Square Enix companion books

Dozens of Square Enix companion books have been produced since 1998, when video game developer Square began to produce books that focused on artwork, developer interviews, and background information on the fictional worlds and characters in its games rather than on gameplay details.

They produced three books between 1998 and 1999 before the line was stopped in favor of the Ultimania (アルティマニア, Arutimania) series, a portmanteau of ultimate and mania.

Both the Perfect Works and Ultimania books have focused primarily on Square and Square Enix's role-playing video game franchises, such as the Final Fantasy and Kingdom Hearts series; over half of the more than 75 books are for games related to the Final Fantasy series.

[5][6] The books are written and edited by Studio BentStuff; beginning with Final Fantasy VII Remake Ultimania in 2020, they switched to be credited to both Studio BentStuff and its parent company Digital Hearts, and since 2023 with Final Fantasy XVI Ultimania they have been credited solely to Digital Hearts.

[9] The highest selling Square Enix companion books are Final Fantasy VIII Ultimania (over 2.2 million copies) and Final Fantasy X Scenario Ultimania (over 1 million copies).