Ace Attorney, known in Japan as Gyakuten Saiban (逆転裁判?, lit. "Turnabout Trial"), is a series of visual novel legal thriller adventure video games, created by Shu Takumiand developed and published by Capcom, in which players assume the role of a defense attorney in a fictional courtroom setting, which is based on the Japanese legal system, to strive to find their clients "not guilty" using investigation, evidence, and cross-examination to prove their case. The series primarily focuses on the main protagonist, Phoenix Wright, a passionate lawyer who seeks out the truth and defends his clients to the end, with later games sometimes featuring other protagonists.
The first three games in the series, originally released exclusively in Japan between 2001 and 2004 for the Game Boy Advance, were ported to the Nintendo DS, taking advantage of features such as touchscreen control, and localized into other regions. These games have also been ported to other formats, such as PC, WiiWare, and iOS. Subsequent titles were developed for the Nintendo DS and Nintendo 3DS systems. To date, there have been five main games in the series, with a prequel game currently in development, as well as two Investigations spin-off games and a cross-over title, Professor Layton vs. Phoenix Wright: Ace Attorney.