System Sounds are the game's menu navigation sound effects, which can be chosen by the player through the tools menu on Urotsuki's Computer, right after selecting a Menu Theme.
Currently, there are 8 System Sounds that can be selected in the game.
Each pack of System Sounds is listed below in order according to the computer menu with a brief description of where it can be found.
| Name | Location | Condition(s) | Image |
| System Sounds #0 | None | Default system sound | |
| System Sounds #1 | Urotsuki's Room | Obtained at the beginning of the game. | |
| System Sounds #2 | |||
| System Sounds #3 | |||
| System Sounds #4 | Data Stream | Obtained alongside Menu Theme #34. | 
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| System Sounds #5 | Nightfall Park | Found by interacting with a flashing human figure at the docks in the lake section. | 
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| System Sounds #6 | Portrait Collection | Found by interacting with the orb below the key-like object. | 
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| System Sounds #7 | Faraway Lands | Found by interacting with the glass sphere. | 
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| System Sounds #8 | Snow Black | Found inside the Keyhole, which is accessible from a purple lock by interacting with the NPC in Fragmented Station A, turning off the snow and interacting with the seven locks in Snow Black to reveal it. | 
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