The release of its sequel Guilty Gear X on the Dreamcast console in 2000 gained much more attention with its gameplay and more detailed graphics. Guilty Gear X was a big development jump as it featured many new characters not seen in the first game of the series. It also had an in-depth and detailed story mode which followed on from the actions of the first Guilty Gear game. Some hailed Guilty Gear X as good competition for the ubiquitous Street Fighter series. Guilty Gear X was the first of the series to spawn many revisions under the Guilty Gear X name. For example, a Japan-only release, Guilty Gear X Plus, was also released in 2001, which fixed various gameplay inconsistencies.
Guilty Gear's popularity in Japan has brought forth considerable amounts of merchandise. In 2001, Arc System Works and Sony Music released drama CD's that fleshed out the game's story in more detail. These drama CDs included narration and voice acting done by the same the voice actors from the game. Artwork books were also released, containing production artwork and unseen art drawn by Daisuke Ishiwatari.
In 2001, Sammy released mobile portable versions of the Guilty Gear series for the WonderSwan: Guilty Gear Petit, and its sequel Guilty Gear Petit 2 (later in the same year). They followed the story line of the previous Guilty Gear X title. These games were only available in Japan.
In 2002, Guilty Gear XX (also known as Guilty Gear X2 in North America) was released. This title furthered the individual stories of each character and improved the combo system. This was soon followed by Guilty Gear XX #Reload (pronounced "Sharp Reload"), which addressed a number of gameplay imbalances in XX and changed both the tiers and the distance between the characters, added a new character legal for use in tournaments, and brought the series online for the first time with Xbox Live. The Guilty Gear XX title has had the most revisions with 4 other titles, Guilty Gear XX Accent Core (2007) being the most recent.
In 2004, Guilty Gear Isuka ("Isuka" meaning crossbill in Japanese, and representing the way two swords clash) was released, featuring up to four-player simultaneous gameplay, a side-scrolling mode called "Boost Mode", a customizable version of one of the characters, a new playable character, and various other additions. This title did not bear an XX in its name, making this an original Guilty Gear game, not a revision.
In 2007, Arc System Works released Guilty Gear 2: Overture for the Xbox 360, which breaks away from the fighting game genre as it plays like a hybrid between a real time strategy game and an action game.
The Gear was a girl named Dizzy, who, while very powerful, lacked a desire for war and unnecessary destruction. She was defeated but her life spared by Sol Badguy. Soon, though, she was found by Ky Kiske, the charismatic police chief of the United Nations and ex-chief of the Sacred Order of Holy Knights. He entrusted her care to Johnny, leader of the Jellyfish air pirates, who welcomed her as one of their own. Jam Kuradoberi, a bounty hunter and struggling chef, claimed credit for Dizzy's disappearance so she could collect the reward and finance her restaurant.
A week has passed without any word from the small Eastern European kingdom of Villtania. However, as refugees are found, the United Nations becomes aware of devastation and ungodly experiments conducted by Villtania's leading sorcerer and scientist, Raimond. As a result, the United Nations declares an international emergency and promptly offers a reward to anyone who can stop Raimond and bring order back to Villtania. A large gathering of warriors attracted to earning the bounty soon fight to decide who will challenge Raimond.
(whose real name is Fredderick, à la Queen's late lead singer Freddie Mercury), a leading character in the game whom the manual describes as an avid fan of Queen. The name "Badguy" is in reference to Freddie Mercury's nickname of Mr. Bad Guy. One of Ky Kiske's special move is called Ride The Lightning, which comes from Metallica's 1984 recording "Ride The Lightning." Ky's Instant kill move is called "Rising Force", which is Yngwie Malmsteens first album released in 1984. One of Testament's tension attacks is Master of Puppets, named after one of the best known heavy metal songs by Metallica. He also has a move called Warrant, another glam metal band.