 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 <unk> , the player can start breaking the psyche @-@ locks by showing the witness evidence or character <unk> 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 <unk> , similar to a tell in poker . 
