Guilty Gear X,[a][b] subtitled By Your Side in Japan, is a fighting game developed by Arc System Works and published by Sammy Studios.

It was released in July 2000 for Japanese arcades, re-released on Dreamcast in December 2000, and later ported to PlayStation 2 in November 2001 and Game Boy Advance in January 2002.

The Dreamcast and PS2 versions have sold over 100,000 copies in Japan; they have been praised for their graphics, controls and characters but criticized for their lack of replay value.

Amid concern about a second war, another Holy Knights Tournament begins; whoever captures and kills Dizzy will receive 500,000 World Dollars.

Shortly after, she is found by Ky Kiske, the police chief of the United Nations and ex-chief of the Sacred Order of Holy Knights.

Jam Kuradoberi, a bounty hunter and struggling chef, claims the credit for Dizzy's disappearance so she can collect the reward and finance her restaurant.

Guilty Gear X has sixteen playable characters: Sol Badguy, Ky Kiske, May, Baiken, Faust, Potemkin, Chipp Zanuff, Millia Rage, Zato-1, Jam Kuradoberi, Johnny, Anji Mito, Venom, Axl Low, Testament and Dizzy.

[23] Guilty Gear X Plus adds three unlockable characters:[23][24] Justice and Kliff Undersn, who returns from the first game,[19] and Robo-Ky, an alternate version of Ky Kiske.

[27] Unveiled at the Amusement Expo in February 2000,[3][28] Guilty Gear X was released to Japanese arcades on the Sega NAOMI system in July 2000.

[41] Greg Orlando reviewed the Dreamcast version of the game for Next Generation, rating it four stars out of five, and stated that "X marks the spot for brutality done beautifully.

"[49] Anoop Gantayat of IGN called the Dreamcast edition "possibly the finest-looking 2D game ever, thanks to the high-res graphics, mega-ultra special effects and smooth animation.

"[30] According to T.J. Deci of AllGame, the PS2 release is "notable for smooth, refined graphics, with richly detailed characters and backgrounds uncommon in 2D fighters.

[9] Guilty Gear X's PS2 version was also generally praised, with Greg Kasavin of GameSpot writing that it "controls smoothly and precisely".

"[47] According to James Fudge for GameSpy, "The gameplay manages to be easy to pick up but isn't dumbed down enough to annoy expert fight fans.

"[7] Its visual were very criticized; GamesRadar panned Guilty Gear X's "overblown aesthetics", giving it the game's worst score (three out of ten): "While it's not completely hellish, it definitely deserves purgatory.

Its arcade music was released on September 20, 2000 as Guilty Gear X Original Soundtrack[g], composed by Daisuke Ishiwatari and arranged by Kazuhito Tomizuka and Yasuharu Takanashi.

"[61] Another reviewer, GoldfishX, gave it a five, calling it "possibly the most ear-grating, hideous sound I have ever encountered in game music" but not giving it a worse score because "Ishiwatari deserves a ton of credit for putting together such brilliant compositions on such pathetic-sounding hardware.

"[62] A second album, Guilty Gear X Heavy Rock Tracks: The Original Soundtrack of Dreamcast, composed by Ishiwatari and arranged by Koichi Seiyama, was released on January 17, 2001.

[73][74] A manga, Guilty Gear Xtra[j] with a collaboration by Ishiwatari, Norimitsu Kaihō and Akihito Sumii, appeared in Kodansha's Monthly Magazine Z on September 22, 2003.

[78][79] Battle for Saint, a compilation DVD with highlights of a Guilty Gear X arcade national championship, was released by Enterbrain on August 22, 2001.