---
key: mechanic/voice-audio--family-19
type: mechanic
id: voice-audio--family-19
lang: en
title: 'Codes, ciphers and hidden messages'
summary: >-
  The player discovers a coding rule and translates a sound sequence into a
  message, command or device setting.
updatedAt: '2026-10-22'
status: active
url: 'https://gamemechanics.pro/en/knowledge/mechanic/voice-audio--family-19/'
jsonUrl: >-
  https://gamemechanics.pro/api/v1/knowledge/en/mechanic/voice-audio--family-19.json
markdownUrl: >-
  https://gamemechanics.pro/content/knowledge/en/mechanic/voice-audio--family-19.md
aliases:
  - Audio codes and hidden messages
tags:
  - Voice and sound
  - Sound as information and material
sourceIds:
  - source-909400af9fbfca32
sources:
  - id: source-909400af9fbfca32
    title: Keep Talking and Nobody Explodes
    url: 'https://store.steampowered.com/app/341800/'
    verifiedAt: null
relations: []
placements:
  - catalogId: voice-audio
    id: family-19
    title: Voice and sound
    url: 'https://gamemechanics.pro/en/mechanics/voice-audio/#family-19'
    categoryIds:
      - material
supersededBy: []
attributes:
  preview:
    updatedAt: '2026-10-22'
    title: Audio codes and hidden messages
    description: >-
      The player discovers a coding rule and translates a sound sequence into a
      message, command or device setting.
    image:
      src: images/mechanics/interface-keep-talking-02.webp
      width: 1440
      height: 810
      game: Keep Talking and Nobody Explodes
      sourceUrl: 'https://store.steampowered.com/app/341800/'
      originalUrl: >-
        https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/341800/ss_11c9963bc5d93a2c31857c94760305208fc9b023.1920x1080.jpg?t=1699020889
      credit: Steel Crate Games / Steel Crate Games
      rights: >-
        © Steel Crate Games / Steel Crate Games. Publisher-distributed Steam
        screenshot. All rights reserved; excluded from MIT and CC BY 4.0.
      caption: 'Keep Talking: a Morse module with a response-frequency control'
      alt: 'Keep Talking: a Morse module with a response-frequency control'
      markers:
        - x: 52
          'y': 48
          label: Decoding determines the frequency; TX transmits the response
    tips:
      - Allow signal replay and consultation of the coding rule.
    examples:
      - title: Keep Talking and Nobody Explodes
        url: 'https://store.steampowered.com/app/341800/'
endsAt: null
provenance: >-
  Original taxonomy adapted from user-selected design discussions; linked
  sources support specific examples, not the whole classification.
license: CC-BY-4.0
codeLicense: MIT
attribution: gamemechanics.pro contributors
catalogKey: catalog/voice-audio
---
# Codes, ciphers and hidden messages

id: voice-audio--family-19
type: mechanic
key: mechanic/voice-audio--family-19
lang: en
status: active
url: https://gamemechanics.pro/en/knowledge/mechanic/voice-audio--family-19/

The player discovers a coding rule and translates a sound sequence into a message, command or device setting.

## At a glance

![Keep Talking: a Morse module with a response-frequency control](https://gamemechanics.pro/images/mechanics/interface-keep-talking-02.webp)

[Keep Talking and Nobody Explodes](https://store.steampowered.com/app/341800/) · © Steel Crate Games / Steel Crate Games. Publisher-distributed Steam screenshot. All rights reserved; excluded from MIT and CC BY 4.0.

1. Decoding determines the frequency; TX transmits the response

- Allow signal replay and consultation of the coding rule.

- [Keep Talking and Nobody Explodes](https://store.steampowered.com/app/341800/)

## How it works

Discover an encoding rule and extract a message.

## Variants

### Symbolic codes

<a id="family-19-branch-1"></a>

- Decode short and long impulses. <a id="family-19-branch-1-variant-1"></a>
- Read a message encoded in pitches or rhythmic figures. <a id="family-19-branch-1-variant-2"></a>
- Map sounds to letters, numbers, directions or actions. <a id="family-19-branch-1-variant-3"></a>
- Infer an unfamiliar sound alphabet. <a id="family-19-branch-1-variant-4"></a>

### Hidden information

<a id="family-19-branch-2"></a>

- Find a message in background noise. <a id="family-19-branch-2-variant-1"></a>
- Isolate a part among layered tracks. <a id="family-19-branch-2-variant-2"></a>
- Detect a message in repetitions, accents or pauses. <a id="family-19-branch-2-variant-3"></a>
- Distinguish a real signal from a similar counterfeit. <a id="family-19-branch-2-variant-4"></a>

### Decoding transformations

<a id="family-19-branch-3"></a>

- Change playback speed to understand a message. <a id="family-19-branch-3-variant-1"></a>
- Play a fragment backward. <a id="family-19-branch-3-variant-2"></a>
- Select a frequency, filter or listening channel. <a id="family-19-branch-3-variant-3"></a>
- Combine message fragments from different sources. <a id="family-19-branch-3-variant-4"></a>

## Context and limits

A working design-space map: 27 families, 81 branches and 324 variants. Voice control, audio-based play and communication can combine or exist separately. Released-game examples support particular techniques; supplementary combinations are design proposals.

## Connected materials


## Sources and provenance

Original taxonomy adapted from user-selected design discussions; linked sources support specific examples, not the whole classification.

- [Keep Talking and Nobody Explodes](https://store.steampowered.com/app/341800/) (id: source-909400af9fbfca32)

CC-BY-4.0 · gamemechanics.pro contributors