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Nine Hours, Nine Persons, Nine Doors
- Quietus
: The Bad End game over music. Starts off with a demented chime, then morphs into a metal, slightly industrial tune. - Chill and Rigor: Reminiscent of Hello Zepp in Saw.
- Recollection: The piece from the moment in the "Submarine" ending when June talks to Junpei before dying in his arms. It also plays in the True ending when Clover and Snake reunite at the chapel note , and in the Zero Lost ending when June gives Junpei her final words before disappearing from existence note .
- 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 final puzzle really changes the mood. A remix of it acts as the backbone of the trailer music of VLR.
- Foreboding: A track that's reminiscent of goldenslaughterer, giving quite an intense atmosphere.
- 9 Years: The music that plays during the true ending/prologue. Also counts as Heartwarming due to the bittersweet finale.
- Unary Game: Guaranteed to induce panic, this plays during the first escape room.
- Binary Game plays in the 1st and 2nd Class Cabins, and it's a chipper tune that screams anything but darkness. Contrasts with "Unary Game" a lot.
- Ternary Game: An oddly energetic track compared to the rest of the soundtrack.
- Senary Game: An extremely dark, yet pumping track playing in several later rooms, setting the mood with its sinister torpedo-shot synth.
- 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 "Snake". 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" despite technically not being the last puzzle.
- Extreme Extrication excels at giving the "escape from the sinking ship" feeling. One of the game's most iconic songs, although not as much as "Morphogenetic Sorrow".
- Trepidation is the devil of the OST. It plays whenever you find a corpse, and it always goes along with extremely detailed descriptions of the bodies. Scary indeed.
- Digital Root tends to play during scenes that are focused on lore or backstory, or when one character is explaining something to another. Its opening notes, which set a calm mood, are easily recognizable, so it can be identified as a recurring motif even after just one run through the game.
Virtue's Last Reward
- Ambidexterity, a remix of Unary Game from 999, plays in the very first puzzle room of the game and during AB games.
- Lounge is a relaxed club beat with shades of the Nonary Game's darkness. Very fitting for an abandoned bar.
- Cabin plays when exploring the Crew Quarters. Unlike you would think of a bunch of forsaken, dark cells, this track is upbeat and energetic, in contrast with the quiet confinement cells of 999.
- Pantry. Who said a pantry couldn't have an awesome investigating theme?
- Biotope, the weird sibling of the other puzzle room songs. It's a very relaxing, cute-sounding track that reminds of nature. It's very fitting for an artificial garden of awesome.
- Monitor, possibly one of the best exploration themes in Zero Escape. It's a techno/electronic song that goes along with a room filled with cameras, monitors and cutting-edge technology.
- Q. The Final-Exam Boss puzzle room brings together some of the game's hardest puzzles, and the room theme has the appropriate intensity without rushing or interrupting your focus.
- Strain plays most often when choosing Chromatic Doors, but it also delivers a good sense of urgency whenever the timed doors are prematurely opened. It also plays when Sigma goes to the Treatment Center to get the neostigmine antidote for K and Phi in K's ending.
- Confession doubles as Tear Jerker or heartwarming music, depending on the situation. It usually plays when a character tells you their backstory, and also makes an appearance when you meet young Akane at the endgame.
- Clarification plays along with the Mind Screwdriver fragment of the story. A very good song for explanations.
- Divulgation plays when you are shown the passwords for the two-headed lion.
- Demise, despite its name, is kinda upbeat and energetic. It usually plays when someone escapes through the 9 door.
- Blue Bird Lamentation, the iconic song of this game, starts cute, continues emotional, breaks epic and bombastic, and then it goes back to cute. It's nearly impossible not to feel sad/warm when this plays in Luna's ending.
- Virtue's Last Reward ~ Piano, a gorgeous piano rendition of Morphogenetic Sorrow followed by the energetic main theme of the game. It plays during the credits roll of the non-Phi character endings.
Zero Time Dilemma
- Tough Decision perfectly captures the tension and the pressure of the characters being forced to make life-risking choices.
- This game's remix of Morphogenetic Sorrow takes the original from 999 in a completely different direction. While the original had several elements playing off each other to create a dramatic mood, this one goes for a minimalist approach, turning it into a slow, deliberate piano solo which manages to be just as heart wrenching.
