In 1997, "" and "Castlevania Legends" were launched for the PlayStation and Game Boy, respectively. "Symphony of the Night" introduced a major change to the gameplay, incorporating RPG elements and a non-linear map that the player could freely explore, which was previously seen in "Simon's Quest" and Nintendo's "Metroid" series. This would be the gameplay for several future titles, beginning with the Game Boy Advance entries "Circle of the Moon", "Harmony of Dissonance" and "Aria of Sorrow", which were released from 2001 to 2003. "Aria of Sorrow" received a 2005 for the Nintendo DS, which was followed by "Portrait of Ruin" (2006) and "Order of Ecclesia" (2008).