---
key: mechanic/time-world-rules--t251
type: mechanic
id: time-world-rules--t251
lang: en
title: Parallel timelines and causality
summary: >-
  Multiple temporal states connect through causal rules, letting actions in one
  timeline change another's possibilities.
updatedAt: '2026-10-22'
status: active
url: 'https://gamemechanics.pro/en/knowledge/mechanic/time-world-rules--t251/'
jsonUrl: >-
  https://gamemechanics.pro/api/v1/knowledge/en/mechanic/time-world-rules--t251.json
markdownUrl: >-
  https://gamemechanics.pro/content/knowledge/en/mechanic/time-world-rules--t251.md
aliases: []
tags:
  - 'Time, information and world rules'
  - Mechanics and variants
sourceIds:
  - source-eceba0e40b661634
  - source-796ac91c3a695e59
sources:
  - id: source-eceba0e40b661634
    title: 'PuzzleScript: Rules'
    url: 'https://www.puzzlescript.net/Documentation/rules.html'
    verifiedAt: null
  - id: source-796ac91c3a695e59
    title: Day of the Tentacle Remastered
    url: 'https://store.steampowered.com/app/388210/'
    verifiedAt: null
relations: []
placements:
  - catalogId: time-world-rules
    id: t251
    title: 'Time, information and world rules'
    url: 'https://gamemechanics.pro/en/mechanics/time-world-rules/#t251'
    categoryIds:
      - mechanics
supersededBy: []
attributes:
  preview:
    updatedAt: '2026-10-22'
    title: Parallel timelines and causality
    description: >-
      Multiple temporal states connect through causal rules, letting actions in
      one timeline change another's possibilities.
    image:
      src: images/mechanics/adventure-day-of-the-tentacle-07.webp
      width: 1440
      height: 810
      crop:
        x: 180
        'y': 0
        width: 1080
        height: 810
      game: Day of the Tentacle Remastered
      sourceUrl: 'https://store.steampowered.com/app/388210/'
      originalUrl: >-
        https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/388210/ss_9eefffbc6bf66978cb5b8570665b09774d4f604a.1920x1080.jpg?t=1731602439
      credit: Double Fine Productions / Shiny Shoe
      rights: >-
        Game imagery © its respective rights holders. Publisher-distributed
        Steam screenshot; all rights reserved. Excluded from MIT and CC BY 4.0.
      caption: Portraits switch between available protagonists
      alt: Portraits switch between available protagonists
      markers:
        - x: 84
          'y': 82
          label: Portraits switch the controlled protagonist
    tips:
      - Show causal links between changes to the past and the resulting state.
    examples:
      - title: Day of the Tentacle Remastered
        url: 'https://store.steampowered.com/app/388210/'
endsAt: null
provenance: >-
  Original bilingual editorial overviews authored for gamemechanics.pro on
  2026-10-20 and reviewed on 2026-10-21. Scenarios are hypothetical design
  examples; prototype checks describe work to perform, not completed playtests.
  Primary sources support the stated techniques and implementation context, not
  every proposed variant.
license: CC-BY-4.0
codeLicense: MIT
attribution: gamemechanics.pro contributors
catalogKey: catalog/time-world-rules
---
# Parallel timelines and causality

id: time-world-rules--t251
type: mechanic
key: mechanic/time-world-rules--t251
lang: en
status: active
url: https://gamemechanics.pro/en/knowledge/mechanic/time-world-rules--t251/

Multiple temporal states connect through causal rules, letting actions in one timeline change another's possibilities.

## At a glance

![Portraits switch between available protagonists](https://gamemechanics.pro/images/mechanics/adventure-day-of-the-tentacle-07.webp)

[Day of the Tentacle Remastered](https://store.steampowered.com/app/388210/) · Game imagery © its respective rights holders. Publisher-distributed Steam screenshot; all rights reserved. Excluded from MIT and CC BY 4.0.

1. Portraits switch the controlled protagonist

- Show causal links between changes to the past and the resulting state.

- [Day of the Tentacle Remastered](https://store.steampowered.com/app/388210/)

## How it works

Multiple temporal states connect through causal rules, letting actions in one timeline change another's possibilities.

## Variants

### Mechanic variants

<a id="t251-variants"></a>

- Past actions alter a persistent future object. <a id="t251-v1"></a>
- Branches create independent choice consequences. <a id="t251-v2"></a>
- Invariants preserve selected facts across timelines. <a id="t251-v3"></a>
- Paradoxes have a predefined resolution rule. <a id="t251-v4"></a>

## Design example

A tree planted in the past supports a future bridge unless the ground is flooded.

Prototype check: Test changing a cause after its result has been used and preserve consistent paradox rules.

## Context and limits

Time and space rules change action causality; the interface must show which state survives a transformation. Each overview separates player actions, state changes and alternative rules. Examples are hypothetical design scenarios, not claims about a named game. A prototype check states an observable question for the next iteration. Existing detailed references remain separately linked from the direction map.

## Connected materials


## Sources and provenance

Original bilingual editorial overviews authored for gamemechanics.pro on 2026-10-20 and reviewed on 2026-10-21. Scenarios are hypothetical design examples; prototype checks describe work to perform, not completed playtests. Primary sources support the stated techniques and implementation context, not every proposed variant.

- [PuzzleScript: Rules](https://www.puzzlescript.net/Documentation/rules.html) (id: source-eceba0e40b661634)
- [Day of the Tentacle Remastered](https://store.steampowered.com/app/388210/) (id: source-796ac91c3a695e59)

CC-BY-4.0 · gamemechanics.pro contributors