Steam game

Theta and Paralldox on Worldlines

A lovely logical puzzle game about the many-worlds interpretation and quantum mechanics.

$9.99 February 3, 2026

By XXela

Windows Controller: full
View on Steam
Theta and Paralldox on Worldlines - XXela. Popular. Released February 3, 2026
Screenshot of Theta and Paralldox on Worldlines gameplay showing in-action mechanics Screenshot 2 of Theta and Paralldox on Worldlines - additional gameplay view Screenshot 3 of Theta and Paralldox on Worldlines - more gameplay footage Screenshot 4 of Theta and Paralldox on Worldlines - final gameplay screenshot

Overview

About this game

  • Theta is a little girl who turns left every time she hits a wall. She is curious about the sinking world and discovers a mysterious place, where she picked up a fork that can split her into multiple copies of herself, and from that moment, the world changes forever.

  • Use the power of splitting to solve puzzles! Split yourself, the universe and something even vaster...

  • The game has 6 main chapters, each revealing at least one hidden truth that already hides within the core mechanics of the game from the beginning. Paralldoxs are under your nose!

  • By experiencing some abstract interpretations of modern physics, you will uncover the creation and operation of parallel worlds and other rules.

  • 240+ handcrafted puzzles, along with meta puzzles and hidden shiny collections that requires power of changing the world.

  • HInt system and Notebook : You can look up the knowledge you've learnt, or think about the essence of current level in Theta's dream.

  • Relaxing Graphics. Sit down and take a rest if you're tired. (Even in darkest places!)

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