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A lovely logical puzzle game about the many-worlds interpretation and quantum mechanics.
Released 03 Feb 2026
A lovely logical puzzle game about the many-worlds interpretation and quantum mechanics.
Developed by XXela · Published by XXela, Delta Theta








Theta and Paralldox on Worldlines has about 283 positive and 6 negative player reviews out of a total 289. We'll add a detailed breakdown here when there are more reviews.
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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Official Discord:



| Platforms | Windows |
|---|---|
| Achievements | 28 |
| Age ratings |
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| Controller support | Xbox |
| Controller required | No |
| Website | Official website |
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