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The gameplay is very different from most third-person shooters, due to a unique dual analog control scheme, which is the main contributor to the steep learning curve of the game. Players travel to various worlds investigating the disappearance of several colonies, with only giant mutated insect creatures left behind. These insects comprise the bulk of the enemies you face along the way.
Players control Kelly or Saburouta with both analog sticks, the left controlling forward/backward movement and turning, while the right aims their weapons, and when clicked, allows quick-turns. Clicking in the left stick while pointing in a direction causes the character to boost. The left trigger is a boost/jump, and when combined with the left analog boost, can be strung together into combos to keep the player off the ground entirely, which is a necessity for some levels. Face buttons are used to select weapons, and the right trigger fires the selected weapon.
The game comprises ten levels, the story unfolding via text between levels, or the occasional in-game cutscene. At the beginning of most levels, excluding boss battles, you have the choice of picking either Kelly or Saburouta. Kelly's primary weapon is fast but weaker, and she's overall faster and more maneuverable. Saburouta is slower, has more limited maneuverability in the air, and carries a stronger primary weapon, the Matchlock Cannon. Basically the two characters make up the two difficulty settings, with Kelly being the "Normal", and Saburouta being the "Advanced" setting. The real difference being that Kelly's style allowed several lock-on targets, while Saburouta's weapon splashed and was aimed at specific targets. Because of this, Kelly's gameplay is more frantic and requires less direct focus, while Saburota required specific aiming and direct attacks to be effective. Kelly is also the only character to upgrade her gearskin.
The artistic style of the game is similar to the steampunk subgenre of fiction, but the game's designers prefer to call it "elec-punk," described as a step even further, with the harnessing of electricity for imaginative new uses. The game's stages are divided into indoor mechanical looking levels, with lots of gears and ornate metalwork, and outdoor stages, set in very organic looking valley's, craters, and other fantastic otherworldly locations.
The game takes place in an alternate history in 1906 where the British Empire rules all of Earth and several extrasolar colony worlds, powered by technology brought to the planet by Halley's Comet in 1835. An unknown substance known as Halley's Core was found throughout the world, and certain individuals who came in contact with it and gained superhuman abilities became known as "Halley's Chosen." The first of these was a scientist named Dr. Hebble Gate, who was affected by the comet while in his mother's womb. With his superhuman mind he harnessed the power of Halley's Core and discovered a wide range of scientific breakthroughs, including fusion and nuclear power, genetic engineering, computers, space travel and countless others. With these technologies the British Empire quickly conquered the earth, and Gate is famous as the man responsible. A complete mystery to all, Gate also holds great power over economic, political and military affairs, and is the founder of the Hebble Foundation and the GunValkyrie (GV) Organization, composed of Halley's Chosen throughout the world to prevent the misuse of technology. He suddenly disappears, throwing the world into shock, and has been missing for four years by the time the game begins.
In addition to his disappearance, the residents of the colonized planet of Tir na Nog have also disappeared, with an outbreak of large alien creatures that resemble giant insects in their place. It is also believed that before his disappearance, Gate was conducting research on how to strengthen the colonists through genetic modification, and it is speculated that the insects and colonists are one and the same.
In response, members of an elite military force within the GV organization, known as "Team Dolphin" (established 1887) is sent to investigate Gate's disappearance as well as the situation on Tir na Nog. Leading the investigation is Gate's only daughter, Lieutenant Meridian Poe, who survives on a life support system developed by her father after he surgically removed her head and disappeared with her body. The two playable characters are Kelly O'Lenmey, born in Ballymun, Ireland, a collected idealist who once aided the Irish Republic in their fight for independence until their methods caused her to leave and join the GV, and Saburouta Mishima, born in Kyushu, Japan, an exiled Samurai of the Meiji Restoration who was saved by the GV after he was unjustly sentenced to capital punishment.
Dr. Gate's fate at the end of the game left ambiguous, as the Poe's Report documents presented throughout the game reveal that a body was eventually discovered, but its identity is not confirmed.
GunValkyrie was originally developed for the Sega Dreamcast. Its visual style was very similar to the final Xbox version. The Dreamcast version's distinguishing feature was that during the game's development, GunValkyrie utilized a unique control scheme using both a light gun and a controller. This control-scheme was dropped when development shifted to the Xbox version.
The game's soundtrack, composed by Teruhiko Nakagawa and Tatsuyuki Maeda, was also marketed during the game's release. It was during this time period that TokyoPop was publishing Sega soundtrack releases in the United States, including GunValkyrie, Virtua Fighter 4, Panzer Dragoon Orta and the Sonic Adventure 2 Official Soundtrack. GunValkyrie Official Soundtrack was released on April 2, 2002. Unusually, and in contrast to the titles mentioned above, a soundtrack CD for the game was not released in Japan.
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On release, Famitsu magazine scored the game a 32 out of 40. In Japan, during the week of the release, the game sold 6000 units becoming the only Xbox game to make it to the top 30 best-selling video games. In 2009, GamesRadar included it among the games "with untapped franchise potential", and commenting on the game's difficulty: "a true gaming workout, but few games in the Xbox library were as beautiful to look at or more rewarding to play."
- GameSpot staff (March 30, 2001). "Spring TGS 2001: New Gun Valkyrie media". GameSpot.com. Retrieved 2009-08-22.
- Xbox - ガンヴァルキリー. Weekly Famitsu. No.915 Pt.2. Pg.105. 30 June 2006.
- Meristation staff (April 2, 2002). Weekly bestsellers in Japan Meristation.com Retrieved 2016/09/11.
- 123 games with untapped franchise potential, GamesRadar US, April 30, 2009