Rogue Galaxy is the North American and European localized version of Rogue Galaxy (2005), only released in Japan at the time. Instead of only localizing the game, developer Level-5 Inc. spent 2 years to improve the game and add new features and content. This version was also re-released in Japan as Rogue Galaxy (Director's Cut).
The original single-layer DVD was replaced by dual-layer and the doubled amount of space was used for smoother, better-looking graphics and additional data. Aside from the 4 existing planets, a fifth one, Alistia, was added. It is not part of the main story, but deepens the storyline and has new quests and items. A key to access the new world can be found in chapter 8. The existing Insectron Tournament sidequest has been expanded with two species of Insectrons, each with 8 types of Insectrons per species. The level design of Rosencaster Prison, the Gladius Towers, the Daytron factory, Rosa's desert town, and Rosa's Labyrinth has also been altered.
Over 2,000 lines of additional voice dialogue were added, the battle animations were reworked, damaging enemies has become easier (attack formula revision) and Toady's analysis of weapons has also been simplified.
Other gameplay improvements include the introduction of collectible Burning Chips, which power the Burning Strike attack, more items overall, two new weapons for each character (except Jaster), with 140 weapons in total, and 5 bonus costumes for each character (6 for Kisala and Simon).