Several Ace Attorney games introduce new gameplay mechanics to the series . Justice for All introduces " psyche @-@ locks " , which are shown over a witness when the player ask them about a topic they do not want to discuss ; using a magatama , the player can start breaking the psyche @-@ locks by showing the witness evidence or character profiles that prove they are hiding something . The number of psyche @-@ locks depend on how deep the secret is ; when all locks are broken , the topic become available , giving the player access to new information . Apollo Justice introduce the " perceive " system , where the player look for motions or actions made by witnesses that show nervousness , similar to a tell in poker .