- Quietus: The Bad End game over music. Starts off with a demented chime, then morphs into a metal, slightly industrial tune.
- Chill and Rigor: Reminiscant of Hello Zepp in Saw.
- Recollection: The piece from the Died in Your Arms Tonight moment in the "Submarine" ending.
- Octal Game: A much more relaxing piece, contrasting the rest of the tracks tense feelings.
- Morphogenetic Sorrow: A track that clearly tells you that this is the finale. The fact that it plays in the Sudoku puzzle really changes the mood. A remix of it acts as the backbone of the trailer music of the sequel.
- Foreboding: A track that's reminiscent of goldenslaughterer, giving quite an intense atmosphere.
- Unary Game: Guaranteed to induce panic.
- 9 Years: The music that plays during the true ending/prologue. Also counts as Crowning Music of Heartwarming due to the bittersweet finale.
- Ternary Game: An oddly energetic track compared to the rest of the soundtrack.
- Septenary Game: A catchy track that is somewhat upbeat with a tinge of melancholy. It plays in the operating room (Door 7) and the shower room (Door 3) that contains the grisly remains of Nijisaki. A nice break from the usual ominous music.
- Nonary Game. Appropriately for a track that uses the name of the game the characters are themselves stuck in, it plays during the Final-Exam Boss room, and it has the feeling of a "final boss". Even though there's actually one last puzzle beyond this room.
- Senary Game: An extremely dark, yet pumping track playing in several later rooms, setting the mood with its sinister torpedo-shot synth.
Awesome Music / Nine Hours, Nine Persons, Nine Doors
Since it's one part Visual Novel, Nine Hours, Nine Persons, Nine Doors is sure to have some of the wonderful music that's usually seen in that genre. Here are samples of some of them.