Guilty Gear Isuka is a game in the Guilty Gear series. Isuka means "crossbill" in Japanese, which is the onomatopoeia of the sound made by two swords when they clash. It is the first Guilty Gear game to include the character A.B.A. One version of the game was released in North America, distributed by Sega, as well as Europe, distributed by ZOO Publishing.
Along with the introduction of a new playable character, Isuka has introduced many new gameplay changes. Unlike the previous installments, Isuka allows for fights with up to four players, and is exclusively programmed for use in tournament play, each stage having a foreground level and a background level. Characters can jump to the opposite plane and perform certain attacks that can hit opponents on opposite planes, but for the most part, moves will only hit characters on the same plane they are fighting on. This mechanic is known as "Line Change", and it was introduced so that during four player mode, players can be separated, also allowing the players to avoid incoming projectiles and attacks during play.