 For "Forbidden Siren 2", the sightjack system was altered slightly by allowing the player to automatically sightjack the closest enemy without having to tune into its frequency.Character-specific features have also been incorporated, such as Shu's ability to move while sightjacking, Ikuko's ability to control sightjacked enemies, and Akiko's ability to reveal psychic impressions from the past when sightjacking in certain areas.The main gameplay itself builds upon that of its predecessor with some significant improvements; such as the ability for characters to crouch-walk, a proximity alert that warns the player of nearby enemies, a hint system that guides the player to the current mission objective, three selectable difficulty levels, and an optional first-person mode.