PCGame

Theta and Paralldox on Worldlines

Logic puzzles built around splitting yourself and exploring parallel worlds

XXela · Published by XXela, Delta Theta · Released Feb 3, 2026

Indie

Reviews
Very Positive
97% of 314
Recent reviews
Very Positive
100% of 36 in 30 days
Players
32
daily peak, Oct 28, 2026
Steam Deck
Playable
Last update on Steam
2 weeks ago
Oct 7, 2026
Minimum PC
4 GB RAM · 0.2 GB disk
Full requirements

What is Theta and Paralldox on Worldlines?

This top-down, single-player puzzle game follows a girl who finds a copy-making fork while exploring a sinking world. You split her into copies and use her automatic left turns at walls to solve more than 240 puzzles across six main chapters. A hint system and notebook help you revisit learned rules.

For you if...

  • +you enjoy difficult logic puzzles with evolving rules
  • +you like searching for hidden collectibles and meta puzzles

Not for you if...

  • −you want cooperative puzzle solving rather than solo play

What players say

97% of 314 reviews are positive · 100% of 36 in the last 30 days

Players praise the inventive puzzles and how thoroughly the game develops its mechanics. Some find controlling multiple characters awkward or confusing at first.

Screenshots and trailer

Theta and Paralldox on Worldlines screenshot 1

Theta and Paralldox on Worldlines system requirements

Minimum: 4 GB RAM, 0.2 GB of disk space.

As published by the developer.

Can my PC run Theta and Paralldox on Worldlines?

The published requirements do not name a graphics card we can compare.

Set up my PC →

Minimum

OS
Windows 10/11
Memory
4 GB RAM
Storage
200 MB available space

Recommended

Requires a 64-bit processor and operating system

Does Theta and Paralldox on Worldlines have co-op or multiplayer?

No: single-player only, no multiplayer modes declared.

Does Theta and Paralldox on Worldlines run on Steam Deck?

Playable Playable: it runs on Steam Deck with some adjustments.

  • Default controller config not fully functional
  • Sometimes shows mouse, keyboard or non-Deck controller icons
  • In-game text is legible on Steam Deck
  • Default graphics settings perform well on Steam Deck

PC version details

DRM
None declared on Steam
Controller
Full controller support
Platforms
Windows
Achievements
28
Steam features
Cloud saves, Family Sharing
Languages
Text only: English, Simplified Chinese, Japanese.

Does Theta and Paralldox on Worldlines use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam

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