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 asks 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 proves they are hiding something. The number of psyche-locks depends on how deep the secret is; when all locks are broken, the topic becomes available, giving the player access to new information. "Apollo Justice" introduces the "perceive" system, where the player looks for motions or actions made by witnesses that show nervousness, similar to a tell in poker.