Gyakuten Kenji (逆転検事, lit. Turnabout Prosecutor) is a visual novel adventure game developed by Capcom for the Nintendo DS. The game is part of the Ace Attorney franchise and is the fourth installment in the series. It follows rookie defense attorney Phoenix Wright as he investigates a series of mysterious cases. Players must collect evidence, question witnesses, and challenge the prosecution's arguments in court to prove their client's innocence. The game features an innovative 'logic chess' system, where players must use logic to outwit their opponents. Gyakuten Kenji also introduces new characters and a variety of gameplay mechanics, such as the ability to switch between characters and the use of 'Psyche-Locks' to uncover secrets. With its engaging story and challenging puzzles, Gyakuten Kenji has been praised for its depth and replay value. Players of all ages and skill levels can enjoy the game's unique courtroom drama as they work to solve the cases and save their clients.