In addition to the storytelling aspect of each album, hidden puzzles and interactive quests are incorporated into the album artwork and into the music itself. Beginning with the "Blood of the Dragon" CD in 2006, Vargo began a tradition of incorporating a quest or adventure within the album artwork and sometimes leaving clues in his narratives. He later went back and did the same for some of the earlier CDs. Now more than half of Nox Arcana's CDs contain some sort of hidden puzzle, which is left to the listener to discover.