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Guilty Gear Isuka is a 2D sci-fi fantasy fighting game developed by Arc System Works and published by Sammy for arcades (running the Dreamcast (Platform)-based Atomiswave (Concept) hardware) on December 17, 2003.
A spin-off entry in the Guilty Gear (Franchise) series, Guilty Gear Isuka builds on Guilty Gear XX: The Midnight Carnival by allowing up to four players to fight each other simultaneously (either free-for-all or in team battles, both using a single-round lives system). This is compounded by a new two-line fighting system (similar to the Fatal Fury (Franchise) series), where players can switch between the foreground an background "lines" (or "planes") using a dedicated button (the "Turn" button, which is also used for turning the character, attacking opponents in the other line, and knocking opponents into the other line). A similar system was later implemented in Guilty Gear Dust Strikers (Game).
The game was later ported to the PlayStation 2 (Platform) on November 2, 2004 (published by Sammy in both North America and Japan, and by 505 in Europe). Japanese and European regions also received a port for the Xbox (Platform) (published by Arc System Works in Japan and 505 in Europe) and PC (Platform) (published by SourceNext (Company) in Japan and ZOO in Europe) between 2004-2006. The PC version was later digitally re-released worldwide on Steam (Concept) (by KISS and Funbox Media) on January 16, 2014.
The console version received a new character to the series (artificial lifeform A.B.A.) and two new game modes: "GG Boost" (a two-player arcade-style beat 'em up in which players fight against waves of enemies to accumulate items, health, and experience) and "RKII Factory" (in which players can customize a special version of Robo-Ky by teaching it certain new abilities). GG Boost mode would later be expanded on in Guilty Gear Judgment (Game).
Much of the game mechanics from Guilty Gear XX remain the same. However, there are some major differences, namely with the Two-Line Battle system. Some of these changes include:
The base arcade game, as well as the Arcade Mode in the console version, is based on the Survival Mode in the console versions of Guilty Gear XX. Players play a seemingly-endless series of 1v1 matches while upgrading their "Level" (by attacking opponents). At Levels 20, 40, 60, 70, 80, and 90, the game is interrupted and players instead fight a team of two opponents. At the maximum Level (99), the game is interrupted and players fight a final match against Leopaldon before the game ends.
Traditionally, Guilty Gear is a one-on-one fighting game in a single 2D fighting "Line" (or "Plane"). Guilty Gear Isuka changes this to a pseudo-3D setup with two 2D fighting Lines (a foreground Line and background Line).
The game includes some new techniques that make use of this system: