Yggdra Union: We'll Never Fight Alone
We'll Never Fight Alone
|Release date(s)||Game Boy Advance
|Genre(s)||Tactical role-playing game|
Yggdra Union: We'll Never Fight Alone is a tactical role-playing game for the Game Boy Advance and PlayStation Portable, developed by Sting Entertainment as the second episode of the Dept. Heaven saga of games. Atlus USA localized and published both versions of the game in North America. 505 Games published the Game Boy Advance version in a limited number of European countries, such as Italy and France. A Nintendo DS side-game was released in Japan on December 3, 2009 as Yggdra Unison: Seiken Buyuuden.
The game is a tactical RPG with an overhead view of a 2D map, managing miniature versions of the units. A card system dictating unit movement and potential skills plays into both enemy and ally turns, as well as the "Union" formation system, in which massive battles can take place between several platoons. There are also some real time elements included during actual battle sequences, such as being able to control how units attack the enemy.
|This article may contain material discouraged by the guidelines for video game subjects. (February 2015)|
The game follows a linear progression of battles in which, when one is cleared, the next begins. Within each battle, units are displayed on a grid of spaces which decide where the characters can move. The player and the computer take turns in which movements are determined and one attack can be executed against an opposing character. The player may choose to end his/her turn at any time.
Unions are the eponymous game play mechanic. Unlike most games, the player is allowed one attack per turn. Attacks are performed in formations called unions. Most unions involve multiple units, but it is possible to attack with a "union" of one unit. Forming unions allows more than one unit to join the battle, allowing for battles between as many as eighty soldiers, grouped into up to five individual battles between two units named 'clashes'. Depending on the gender of the unit, the formation required for a union will be different. Males have an x-shaped formation, whereas females have a +-shaped formation. Linked unions, which become available during the fifteenth battlefield, allow units within the core union to apply their union pattern to extend the overall union.
Each unit that can be included in a union is composed of a leader, the head, and as many as seven underlings, or 'members'. For example, in the case of Yggdra's unit, Yggdra is the head, and her five members are Sword Maidens. Each unit has a weapon type, with strengths and weaknesses in a rock-paper-scissors fashion. Each unit comes with six stats: Morale, an indicator with a function similar to Hit points; GEN, generalcy; ATK, attack; TEC, technique; and LUK, luck. The final stat depends on alignment of the unit. Player units have REP, reputation, measuring victory rates, and enemy units have POW.UP, which is a reducible stat that increases card POW upon player victory. Each unit also has the potential for five 'effects', which are strategy altering hooks that do many things, from the in-clash voiding of damage enhanced with a particular element, to out of clash Morale restoration. Up to four effects can be innate to the unit, with one effect coming from the unit's equipped item. Items are multi-purpose in Yggdra Union; they can be equipped for stat ups and effects, or they can be consumed to recover Morale. Equipped items cannot be removed, and will disappear after a set amount of battlefields.
- Aggression and Rage
After the first battlefield has been cleared, the player may control how the character attacks in a clash by changing the Aggression modes, and the enemy's mode of attack will shift with the gradually increasing Rage meter - a holdover from Riviera. When a unit is in Passive mode, Aggression will fill, but the damage the unit deals will be reduced. If there is Aggression in the gauge, the unit can enter Aggressive mode, depleting said Aggression, dealing more damage and also activating the innate element of the unit, if one exists. If Aggression reaches 100%, a card skill can be activated. The enemy's Rage works in a similar way, except that Rage continuously fills until either Max is reached, or is stopped by a skill or effect. When Rage becomes half full, the enemy will enter Rage mode, the damage the enemy deals will increase, and the enemy's innate element, if it has one, will activate. When Rage is full, the enemy enters Max mode, damage increases again, and any activated element is removed from damage. In Max mode, the enemy is also able to activate skills. Rage will carry over between clashes in a union based on the outcome of the union; if the enemy loses, all accumulated Rage will carry over, but if the enemy wins it will start empty in the next clash. Player Aggression carries over regardless.
At the beginning of each turn, a card must be chosen. Unlike many card games, a card is not drawn randomly from a deck, but rather picked from a hand of anywhere from one to thirty cards selected before the battle begins. Each card has three attributes: POW, ACE, and MOV.
- POW is the overall strength of the card and factors into how much damage the loser of a clash takes. The higher the power, the more damage the enemy will take.
- ACE is what weapon type the Union leader must use to allow the skill held by the card to be usable. If the ACE is sword, a sword user must start the Union. If it is All, then anyone can start the union.
- MOV is the total movement available to all characters. For example, when a card with five MOV is picked, five characters can each move a single space, one character can move five spaces, or any other combination.
Each card also has a skill, ranging in effect from restoring allies and killing enemies, to changing the landscape and even invincibility. For these skills to be activated, the Union leader must first match the ACE of the card. In addition, there are two types of skills: A and B. B-type skills require the B button be held to charge a bar, at which point, if released, the skill will activate and deplete the Aggression gauge. A-type skills are activated by pressing A, and holding it for as long as the skill's effects are desired, or until the Aggression gauge is completely depleted. Many skills have certain requirements of their own, such as Steal - which steals any item the enemy might be holding - being usable only by Milanor.
When 100% Aggression or Max Rage mode is reached and all other conditions are met, a skill can be activated. Each skill has a rule or equation for its mechanic; for example, Steal will succeed if the user's TEC is larger than or equal to the target's GEN, otherwise it will fail and the opponent's item will not be stolen. These rules and equations can affect how effective the skill is when used by a certain unit.
In the PSP version, a normal playthrough will be significantly easier than in the GBA version as Morale is restored to characters upon level ups. Upon successful completion of a normal playthrough, a Hard mode will be unlocked in which Morale is not restored, leaving the game essentially as it was in the original GBA version. Also, only in Hard mode can certain new story sequences and characters be accessed. Some cards had effects and requirements changed in the PSP version, leading to the difficulty fluctuating further. For example, the Refreshment skill heals Morale in the PSP version making it even harder to die, yet Lightning Bolt, the card used by recurring enemy Mizer, is able to inflict a new status effect.
The story of Yggdra Union starts with the Princess of Fantasinia, Yggdra, fleeing her besieged home with the family heirloom, the Holy Sword Gran Centurio. Throughout the story, the idea that justice lies with the Holy Sword is used to drive Yggdra and her army forward through their plight, as well as to provide explanation to them for the acts they commit. It is constantly used as justification for their acts, particularly those situations in which civilians are slaughtered during the war.
The story mainly details Yggdra's reclamation of her kingdom from the Bronquian Empire, and her eventual uniting of the entire world under her sovereignty, with quite a few stops along the way leading to an intricate and involving plot. The ending is split off based on the player's actions, one ending essentially being a game over and the other two being open ended with Yggdra either pursuing the ideal that justice lies with the holy sword, or sacrificing it to achieve universal peace.
In the PSP version, additions were made to the story that further develop the Dept. Heaven universe and story, deeply tying the game into mythological elements first developed by Riviera, with the more direct appearance of Diviners, and Grim Angels, and passing mention of Malice, Hector and The Seven Magi. With the events of Yggdra Union's PSP ending where the Royal Army attack Ragnarok, this is now cemented into the canon storyline, marking Yggdra Union as a prequel to Riviera: The Promised Land.
Yggdra Union features a large cast of characters, the most important of which is the seventeen-year-old princess, Yggdra Yuril Artwaltz, whose plight is the center of the story. The lead male of the story is Milanor, the seventeen-year-old thief king; The Silver Wolf, whose home was burned down by the Empire in an attempt to find Yggdra. These two start and lead the Royal Army to take back the Kingdom from the Empire. One ally they recruit is Durant, the twenty-four-year-old leader of the Third Cavalry, a knight of Paltina. Nietzsche, the twelve-year-old, naïve Undine from Embellia joins the Royal Army to gain revenge on the Empire for their espionage in her country, as well as to search for the Transmigragem. Twenty-one-year-old Necromancer Roswell of the Branthese house and nineteen-year-old Witch Rosary of the Esmeralda house are met in Verlaine Hills, one of which will join the Royal Army for revenge on the Empire's involvement and betrayal in Verlaine and to recover the Ankhs, the other of which will die at the hands of the Royal Army. Kylier is a seventeen-year-old Griffon Rider from Lost Aries, with an affection for Milanor, who never really joins the Royal Army, but assists them when they need help most. She rides her Griffon Al into battle. The Astral Fencer, the twenty-five-year-old Russell betrays the Empire and joins the Royal Army for revenge for his fiancée Flone, and to repay the Royal Army for his actions against them. Cruz is a twenty-two-year-old hunter, who made it to number one on the Empire's Most Wanted List for his leadership of the Karona Resistance and joins the Royal Army after his headquarters is tracked down and attacked by Mizer. Elena is the sixteen-year-old Assassin that joined the Empire for a chance to stop her brother, Leon, to restore honor to her family, and when her betrayal becomes clear, and the Royal Army aids her, she joins to repay her debt to them. Gordon, of the Temple Knights of Welheim is another ally to the Royal Army, albeit only for a short time. He joins when the Royal Army offers assistance in saving the Pope.
The Empire contains many characters, too, starting with the twenty-year-old Bronquian Emperor, Gulcasa. A descendant of Brongaa, and seeker of his resurrection, Gulcasa took the Empire in a violent coup d'état, and immediately began conquering neighboring countries. Despite his violence, he has full support of the Bronquian people. His direct subordinates, the eighteen-year-old Twin Valkyries Aegina Eine Artwaltz and Luciana Rune Artwaltz, apparently of Royal lineage, make constant attempts on the Royal Army, Yggdra in particular. Leon is the first introduced of the five Dragon Generals, twenty-two-year-old brother to Elena, he is called the Black Knight for his excessively wanton violence and cruelty. Emilia, a Dragon General titled the Scarlet Princess, is half-sister to Gulcasa through a shared father. She abhors being labeled a child, and will do anything to defend Bronquia. Baldus, the Dragon General known as the God of War, is an older, wiser, yet extremely powerful warrior of Ishnad. The last of the Dragon Generals is Nessiah, the Imperial Army's war strategist, truthfully a Fallen Angel igniting wars to enrich the Gran Centurio with which to take revenge on the Gods. Eudy, the twenty-eight-year-old Court Magician, is another high ranking general in the Imperial army, and the cause of many cannon woes.
The game features many more characters, both enemy and otherwise that further delineate the story and lengthen the quest. The PSP version added a few new characters, including an elderly man named Bly, a woman named Mistel, and an angelic figure referred to simply as #367. The PSP version added also full voice acting, with notable talents including Mai Nakahara as Yggdra, Miyuki Sawashiro (みゆき) as Milanor, Yui Sakakibara as Kylier, Atsushi Kisaichi as Durant, Ai Maeda as Nietzsche, Akemi Satō as Rosary, Ai Nonaka as Emilia and Mariko Suzuki as Zilva.
Yggdra Union had a small development team, consisting of less than 25 members. Shinichi Ito, director and designer of Riviera, played the same developmental role in Yggdra Union. Also reprising their roles are composers and sound designers Minako Adachi and Shigeki Hayashi. Masanori Ishikawa, one of Riviera's programmers, returned to be one of the two Yggdra Union programmers. Riviera's character designer, Sunaho Tobe, managed the card illustrations, with Satoko Kiyuduki taking on character design. Sting also contracted Atlus USA to write English text for the Japanese version's script.
The game started development in early 2005 under the project name "YGG", with the official unveiling to the public being in October 2005 through Famitsu and Sting's official site. The game changed quite a bit throughout its development. In early designs, the GEN stat did not exist, characters instead being assigned LDS and INT stats, as well as a "FREEZE" status effect that did not make it into the final version. Also in these early designs, the character art was incomplete, leading the designers to resort to the recycling of Riviera resources during development. In the first released screenshots, it can be seen that Aggression functioned in reverse, the directional buttons coinciding more literally with the change in Aggression produced by their manipulation, rather than symbolically. The cards were initially shown to have a great deal more MOV, along with the much larger maps.
There were some problems in Yggdra Union's development. One such situation was a worry that they would not be able to fit all of the data onto the cartridge, but Sting okayed the release of the game on a larger cartridge, alleviating any space problems. The largest problem was character design. Many different character designs were produced, but the creators of the game had difficulty agreeing on which ones to use.
The PSP version, also initially revealed by Famitsu and soon after confirmed by Sting, was given many new features, including completely redrawn sprites and new characters, as well as modified game mechanics such as increased unit capacity, and an animated opening cutscene previewed on the development blog. Other changes include new story sequences following one of the endings of the game, returning character Pamela as playable, a hard mode, new status effects attached to several skills, as well as new cards and battlefields.
Following the surprising success of Riviera: The Promised Land, Atlus USA was quick to take the opportunity to end "on a high" on the GBA by localizing Yggdra Union. This decision caused the release to be pushed back as Atlus USA announced more GBA games such as Summon Night: Swordcraft Story and Super Robot Taisen: Original Generation. This also led to the game being missed by many, having only ten recorded reviews on Game Rankings.
Yggdra Union was a particularly difficult game to localize due to the stylistic presentation. Characters have effects, innate abilities attached to them. These effects are formatted in such a way that in the Japanese version of the game, there was only room for seven characters of a 10-pixel-tall font. Nich Maragos, lead editor in the localization effort, notes such difficulties as the extreme text constraints, as well as Atlus USA's busy release lineup leaving Yggdra Union short on staff. Atlus USA's localization of the PSP version was released on September 16, 2008.
When Atlus released the English version of Yggdra Union, the bath scene was more explicit than the Japanese counterpart. Not only was a key piece of foliage blocking the scene removed and the lighting softened, but two dialogue faces were replaced (in the Extra Contents section, there are two slots for these faces, which must be unlocked through the scene, but no actual artwork can be seen). The Japanese PSP version also contains a censored version of the bath scene, however significantly more is revealed. Nich Maragos has explained that he had "softened" a character's line in one of the tutorials during editing due to it being out-of-character and therefore potentially damaging to the audience's perception of said character. He explained that it is his job to "remain faithful to the spirit of the game, not the letter, and the most important thing is to make sure everyone in the game sounds natural."
Relatively little merchandise for Yggdra Union has been released, in contrast to the large quantities for Riviera. This is despite the fact that Sting has posted a survey asking what types of merchandise fans would like, as well as the varied results collected. The Perfect Audio Collection Plus was in the works before the survey was ever released, however, because Sting was certain that an official soundtrack would be a popular request.
- Character Making Card: A card featuring concept art and information on Yggdra. Packaged in the limited GBA pre-order box.
- Yggdra Full Metal Strap: A metal keychain with Yggdra's likeness carved out and "We'll never fight alone" engraved. Packaged in the limited GBA pre-order box.
- Yggdra Union Poster: A B1-sized promotional poster. Only ten were made and they were given away in a drawing held by Sting.
- Yggdra Union Official Guide Book: A guide book for the game. Released on April 21, 2006.
- Yggdra Union Perfect Audio Collection Plus: A two-disc soundtrack featuring all of the music from the game. Released on April 21, 2006.
- Yggdra Union The Complete Guide: A guide book updated for the PSP version of the game, featuring a large amount of artwork and interviews. Released on February 23, 2008.
- Yggdra Union Anthology Comic: A collection of comics based upon Yggdra Union, drawn by various artists. Released on March 31, 2008.
- Yggdra Union PSP Version Official Soundtrack: A one-disc soundtrack featuring all tracks used in the PSP version of the game, including the new remixes of all battle tracks and the opening theme. Released on June 23, 2010.
- Yggdra Union March Theme Collection: An iTunes-exclusive album featuring all overworld themes from the game. It includes an extended remix of the title theme. Released May 4, 2011.
- Yggdra Union Battle Theme Collection: As with the above, an iTunes-exclusive album featuring the PSP version battle themes. It includes an extended remix of the unit demo theme. Released May 4, 2011.
Aside from physical merchandise, Sting has also released a large amount of Yggdra Union download content for their mobile service Sting Station (スティング☆ステーション sutingu suteeshon?), such as calendars and wallpapers featuring artwork from the game, ringtones based on soundtrack themes, and even several games that can be downloaded and played.
Yggdra Union has an extensive soundtrack, totaling nearly sixty tracks co-composed by Shigeki Hayashi and Minako Adachi. This near-half division of effort left Shigeki Hayashi mostly with character themes and promotional music, and Minako Adachi with the story, map and menu music. The soundtrack is an entirely original composition, except for the song Heaven's Gate (ヘヴンズゲート hevunzugeto?), which is explained to be a bell-heavy arrangement of the Riviera song Heaven's Gate (ヘヴンズゲート hevunzugeto?). Aside from the music, the audio in the GBA version of Yggdra Union is fairly standard, with sound effects in battle and beeping for text of a pitch based on the character speaking. There is no voice acting in the GBA version, but, despite that fact, one of the many fan demands since even before its release is a Drama CD.
A third of Yggdra Union's soundtrack is dominated by Shigeki Hayashi-composed character themes, which are important in the presentation of the battles. When a clash starts, the attacker's theme song is the background music used for the entirety of the clash, and, when a player-controlled character is the attacker, the pacing of the music is dictated by the mode; in Aggressive, the music will speed up, in Passive the music will slow down, and when Neutral the music will play normally.
The first official compilation of the Yggdra Union soundtrack was the Yggdra Union Perfect Audio Collection Plus, released a month after the GBA version's Japanese release. The collection is made up of two discs, the original BGM containing songs directly from the GBA version of the game, and the image BGM containing instrumented versions of the songs. The compilation also contains six bonus songs, one being a collage of the battle themes and appearing at the end of the original BGM, and the other five being arrangements of various tracks, placed at the end of the image BGM. In the soundtrack insert is a large amount of artwork, as well as notes from Shinichi Ito, Minako Adachi and Shigeki Hayashi on the soundtrack itself, and notes on each song's instrumentation, design and implementation.
Upon the release of the "Sting the BEST" version of the game, however, another soundtrack was produced in Japan, compiling the new orchestrations of the PSP battle themes along with the "image BGM" versions of Adachi's tracks, which were used in the PSP version of the game.
For the most part, reactions to Yggdra Union were positive, with a 79% average score on GameRankings for the Game Boy Advance version and 76% for the PSP version. A variety of issues were cited in reviews of the game. Some complained about the unnecessary strictness in the card usage limitations that "seem like they’re in place to keep you from doing cool things rather than facilitate them" and that a certain few cards "were applicable in many situations, giving the most flexibility." Some were upset by the music; RPGamer believed the music was "the one thing which truly drags upon the game", and still others were displeased with the union system and the stylistic presentation of the game. The odd name and pronunciation of "Yggdra" is oft-noted.
In Japan, the game tied in fortieth place in Famitsu's Reader's Top 100 Games of 2006 and received a 35/40 from Famitsu. However, the game was unable to break the top ten, debuting in thirteenth place in national sales. Despite this, when Yggdra Union was released in Japan, GBA sales saw a noticeable spike, a potential correlation noted by GamesAreFun. The PSP version managed to top out at ninth place in its first week, with sales of 17,304.
On March 1, 2007, Sting released to their Sting Station download service a platformer starring Nietzsche, titled Nietzsche's Treasure Hunt (ニーチェの宝探し niiche no takara sagashi?). The game features Nietzsche swimming through aquatic levels and collecting treasure.
Not long after the announcement of the PSP remake of Yggdra Union, a larger mobile phone game effort was released called Yggdra Unison: Beat Out Our Obstacle (ユグドラ・ユニゾン yugudora yunizon?). The game features a territory conquering system similar to that found in games like Emperor: Battle for Dune. There are eleven armies vying for 36 territories in the game, each taking a turn in which they can attack a neighboring territory, potentially conquering it and thus increasing their presence on the continent. In battle, characters move around in real time, and when two opposing enemies encounter each other, a skirmish more similar to those found in Fire Emblem is initiated, with the units attacking each other. With proper timing a Unison attack can be activated, in which all allies within a circular range of the skirmish will also engage. The cards featured in the original Yggdra Union are also activated within skirmishes. A Nintendo DS port of this game has been released in Japan in December 2009.
JaJa's blog had featured discussion and photos of Yggdra Unison (code-named "YZ") for several months before the official announcement. The game was officially announced at the end of November 2007, and released in early December of that same year.
In January 2008, Sting released two more download games, Milanor Dash! (ミラノダッシュ！ mirano dasshu!?) and Yggdra×Quiz×Union (ユグドラ×クイズ×ユニオン yugudora×kuizu×yunion?), the former being a falling-item collection game featuring Milanor, and the latter being a quiz game featuring questions about the game's story and mechanics. In May 2008, yet another download game was released, Yggdra Puzzle (ユグドラ・パズル yugudora pazuru?), a falling block puzzle game.
In May 2010, a prequel concerning the events of Gulcasa's ascension to power in Bronquia was released in Japan. The game was published by Atlus and features a new scenario writer and new character designer, although many staff members between the two games remain the same. As its subtitle, "Story to Reach the Future", suggests, Blaze Union has three branching story paths which allow the player to attempt to find a different future for the Imperial Army and avert the events of Yggdra Union entirely.
- Narration: "Since King Paltinaeas's founding of the Kingdom of Fantasinia, the Holy Sword Gran Centurio has lit a path for the kingdom in the name of justice. " Sting (2006-11-21). "Yggdra Union". Game Boy Advance. Atlus USA.
- Yggdra Union Official Guidebook (ユグドラ・ユニオン ガイドブック) (in Japanese). SoftBank Creative. 2006. pp. 6–9. ISBN 4-7973-3576-9.
- Extra Contents: "Fantasinia's Princess. Her full name is Yggdra Yuril Artwaltz." Sting (2006-11-21). "Yggdra Union". Game Boy Advance. Atlus USA.
- "ユグドラ・ユニオン：Character". Character Description page. Retrieved June 3, 2007
- "ユグドラ・ユニオン：Character". Character Descriptions. Retrieved October 19, 2007
- Extra Contents - Credits Sting (2006-11-21). "Yggdra Union". Game Boy Advance. Atlus USA.
- "ATLUS U.S.A., INC. ANNOUNCES "YGGDRA UNION" FOR THE GAME BOY ADVANCE" (Press release). Atlus USA. February 3, 2007.
- N-Philes Interview with Tomm Hulett of Atlus USA. Retrieved May 4, 2007
- JaJa's Development Blog March 2005 entries. Retrieved June 24, 2007
- GAF News Article announcing Yggdra Union, as well as noting the pre-announcement page attaching Riviera developers to the project. Retrieved on April 30, 2007
- Yggdra Union Set for PSP Retrieved on October 4, 2007.
- JaJa's Development Blog 2006/12/01 entry. Retrieved October 4, 2007
- RPGamer's Japandemonium: 11-24-2005. Retrieved June 19, 2007.
- Gamasutra Interview with Jim Ireton of Atlus USA. Retrieved May 4, 2007
- Static Multimedia Interview with Zach Meston of Atlus USA. Retrieved on May 4, 2007
- deeko Interview with Zach Meston of Atlus USA. Retrieved on May 4, 2007
- "Yggdra Union GBA GameRankings". Game Rankings. Retrieved 2012-09-26.
- 4 color rebellion Interview with Nich Maragos of Atlus USA. Retrieved May 4, 2007
- "ユグドラ・ユニオン：Special". Goods Survey Results. Retrieved June 3, 2007
- ユグドラ・ユニオン Perfect Audio Collection Plus (booklet). Various Artists. Five Records. 2006.
- "ユグドラ・ユニオン：Special". Preorder Goods information. Retrieved June 3, 2007
- "ユグドラ・ユニオン：Special". Poster information. Retrieved June 3, 2007
- "ユグドラ・ユニオン：Special". Guide Book information. Retrieved June 3, 2007
- "ユグドラ・ユニオン：Special". Perfect Audio Collection Plus information. Retrieved June 3, 2007
- Amazon product page, retrieved 13 June 2011
- ユグドラ・ユニオン 進軍テーマコレクション at iTunes, retrieved 13 June 2011
- ユグドラ・ユニオン バトルテーマコレクション at iTunes, retrieved 13 June 2011
- Neigher, Eric (2008-09-16). "Eurogamer GBA Review". 1UP.com. Retrieved 2012-09-26.
- GAF News Article of Famitsu reviews for the week of Yggdra Union's release. Retrieved May 21, 2007
- "Yggdra Union Game Informer Review". Game Informer. Retrieved 2012-09-26.
- Noble, McKinley (2008-09-16). "Yggdra Union GamePro Review". GamePro. Retrieved 2012-09-26.
- "Yggdra Union PSP Metacritic Scores". Metacritic. Retrieved 2012-09-26.
- Kasavin, Greg (2006-12-14). "Yggdra Union Review - GameSpot.com GBA". GameSpot. Retrieved 2012-09-16.
- Mc Shea, Tom (2008-10-01). "Yggdra Union Review - GameSpot.com PSP". GameSpot. Retrieved 2012-09-26.
- Vasconcellos, Eduardo (2003-10-08). "GameSpy: Yggdra Union PSP". GameSpy. Retrieved 2012-09-26.
- Adams, Chris (2007-01-11). "Yggdra Union Review - IGN GBA". IGN. Retrieved 2012-09-26.
- Clements, Ryan (2003-09-17). "Yggdra Union Review - IGN GBA". IGN. Retrieved 2012-09-26.
- "Yggdra Union PSP GameRankings". Game Rankings. Retrieved 2012-09-16.
- "Yggdra Union GBA Metacritic Scores". Metacritic. Retrieved 2012-09-26.
- Jonnyram (2007-03-15). "Famitsu readers' Top 100 games of 2006 NeoGAF". Retrieved 2012-09-26.
- GameCritics Review. Retrieved May 12, 2007
- RPGamer Review. Retrieved May 12, 2007
- Yggdra Union remade for PSP - PSP Fanboy. Retrieved January 9, 2008.
- RPGFan Top Ten Sales. Retrieved July 1, 2007
- GAF News Article detailing Japanese hardware sales for the week of Yggdra Union's release. Retrieved May 28, 2007
- GamesAreFun reports first week sales for Yggdra Union PSP. Retrieved February 4, 2008
- "スティング☆ステーション：アプリ". Sting Station Application page. Retrieved June 3, 2007
- ユグドラ・ユニゾン ： システム Yggdra Unison system description page. Retrieved on January 9, 2008.
- JaJa's Development Blog 2006/10 entries. Retrieved January 9, 2008.
- STING： Old Sting News. Retrieved on January 9, 2008.