Game · XXela, Delta Theta
Theta and Paralldox on Worldlines
A lovely logical puzzle game about the many-worlds interpretation and quantum mechanics.
Before you buy
- Redeem on
- Steam clientPC: Windows. Needs a free Steam account.
- Activates in
- Europe and UK. Activates on accounts registered in 32 countries: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, United Kingdom.Activates on accounts registered in the EU, EEA, Switzerland and the United Kingdom.Will not activate on accounts registered in North America, Asia, Latin America or Oceania.
- You get
- A digital activation keyStandard edition. No disc, no box.
- Delivery
- To your account and by emailDelivered to your account and by email once it is ready. Some orders get a short manual check first.
Trailers and screenshots
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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Official Discord:
Description, images and details are taken from this product's Steam page.
Details
- Developer
- XXela
- Publisher
- XXela, Delta Theta
- Released
- 3 Feb, 2026
- Genres
- Puzzle, Indie, Family
- Runs on
- Windows
- Activates on
- Steam client, Europe and UK
- Interface
- English, Simplified Chinese, Japanese
- Controller
- Full controller support
- Single-player
- Steam Achievements
- Full controller support
- Custom Volume Controls
- Keyboard Only Option
- #category_playable_at_your_own_pace
- Playable without Timed Input
- Save Anytime
- Steam Cloud
- Family Sharing
System requirements
Windows
- Requires a 64-bit processor and operating system
| Component | Minimum | Recommended |
|---|---|---|
| OS | Windows 10/11 | |
| Memory | 4 GB RAM | |
| Storage | 200 MB available space |
Activating it on Steam client
- Open the Steam client and sign in.
- Choose Games in the top menu, then Activate a Product on Steam.
- Paste the key and confirm. It appears in your library.
The key is listed for the Europe and UK. Activates on accounts registered in 32 countries: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, United Kingdom. region. Read how regions work before you buy.