Codename Cygnus is an episodic interactive audio drama. An agent working for an organization known as Cygnus infiltrates the secret organization Trident to take down it's leader, Neptune. The player is given a choice between scenarios to complete the mission, which is selected through voice recognition or through button input. Most of the branching consists of how you handle things, such as whether you’re bold or secretive, stealthy or athletic, and so on. You’re presented these stats on screen as they change based on how you handle the mission.