Main Levels
- Level 0 - Constant Hum-Buzz
- Level 1 - Low Hum-Buzz Rumbling of Machinery
- Level 2 - Quiet Rumbling of Machinery
- Level 3 - Loud Rumbling of Machinery
- Level 4 - Office Ambient Quiet Hum-Buzz
- Level 5 - Relaxing Piano Music or scary Music if in dangerous area Quiet Hum-Buzz Boiler Room: Same as Level 3
- Level 6 - Loud Distant Screaming
- Level 7 - Water Sounds
- Level 8 - Cave Ambient Minecraft Cave Sounds
- Level 9 - Nightime Ambient
- Level 10 - Wind Noises
- Level 11 - Big City Ambient
- Level 12 - None
- Level 13 - Quiet Hum-Buzz
- Level 14 (Hospital) - Same as Level 9
- Level 14 (Paradise) - Relaxing Music
- Level 15 - Same as Level 3
- Level 16 (Hospital) - Same as Level 14 and Constant Annoucements about Entity 19
- Level 17 - Same as Level 7
- Level 18 - Same as Level 13 and Children Laughing
- Level 19 - Same as Level 13 and Screeching
- Level 20 - Same as Level 10
- Level 21 - Same as Level 13
- Level 22 - None
- Level 23 (Factory) Factory Ambient
- Level 23 (Garden) Bird Sounds
- Level 24 - None Cuz it's Space and you can't hear in space
- Level 25 - Arcade Ambient
- Level 26 - Same as Level 13
- Level 27 - Same as Level 19
- Level 28 - Same as Level 19
- Level 29 - Level Ambient From Paintings
- Level 30 - Piano Sounds
Levels
- Level -0 - Constant Glitching
- Level -1 - Same as Level 5 but without the Hum-Buzz
- Level -2 - Same as Level 7
- Level -3 - None
- Level -4 - Same as Level 9
- Level -5 - Blizzard Ambient
- Level -6 - Same as Level 19 and Level 8
- Level -7 - Same as Level 10
Secret Levels
- The End - Same as Level 0
- Level FUN! =) - Party Music (Commonly Daisy Bell)
- The Hub - Tunnel Ambient
- The Metro - Station Ambient
- The Dark Metro - Same as The Metro
- Level Secret Gateway - None
Oddball Levels
- Level ! - Alarm Sounds
- Level ' - Neighborhood Ambience