Theta and Paralldox on Worldlines

Theta and Paralldox on Worldlines

XXela · 2026 · Puzzle, Sokoban, Logic, Time Manipulation, Cute

PC
Very Positive97% · 238
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Standard Edition · Steam
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About Theta and Paralldox on Worldlines

  • 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!)
Click "Add To Wishlist"!Official Discord: https://discord.com/invite/nM6vPdMke6

What Steam players say

Recent verbatim reviews from Steam — separate from playze.io community reviews below.

Recommended Jun 3, 2026
Theta overtook A Monster's Expedition as my favorite puzzle game of all time. I reached the first ending and finished all the numbered levels, and I want to continue and 100% the game. First of all, the theme and mechanics in this game is extremely unique. Controlling multiple characters is always going to be finicky, and even after I've finished the game, it is still finicky. However, very few if any of the levels that I've solved are reliant on difficult positioning of multiple characters. The prologue and first chapter is a bit like Stephen's Sausage Roll where you kind of have to suffer through the strange movement rules before you get to the actually interesting stuff. If you want to play this, you should be prepared to stay with it until you get to chapter 2. If you are in chapter 2 and it still is not fun, then the game is probably not for you. Every mechanic introduced is super interesting and more than justifies the jank from the base movement rules. Theta also inspired me to learn about quantum mechanics and the many worlds interpretation. The puzzle design is really good, on par with greats like Magicube, Stephen's Sausage Roll, and Snakebird. However, not ALL the puzz…
5 found this helpful
Recommended Jun 18, 2026
While I've still got a good chunk of the game left to beat, I've played enough to confidently recommend it to others. It's a puzzle game based around a classic mechanic of clones, where you're controlling 2 or more characters at the same time, sharing inputs between both. However, instead of it being a throwaway mechanic to pad time, or just one of many mechanics that don't get fleshed out much, it makes this its core theme and goes all in. With a mechanic as inherently complex and intimidating as this, it's imperative that level design and curation be good. You want to show players cool stuff and not have them get lost in the complexity of the possibility space. The game does a great job at that, though for the first chapter of the game it might still feel a bit intimidating as you get used to its controls. It's sort of like Stephen's Sausage Roll in that respect, where the strange movement is something that you'll slowly get used to as you play, but the whole time the game is showing you new interesting wrinkles to the mechanics, and levels rarely feel like filler or difficult just for the sake of being difficult. Level difficulty is somewhat mid-high. I feel like it's roughly …
3 found this helpful
Recommended Jun 22, 2026
I think this is unironically the best puzzle game I have played so far. Worth every hour
1 found this helpful
Recommended Jun 2, 2026
this game is hard like benji ™
1 found this helpful
Recommended Jul 6, 2026
Excellent puzzles: difficult, but easy to get an overview of so your time is spent solving and not deciphering what the puzzle is. The music loop gets old very fast, though.
Recommended Jun 15, 2026
A mind-boggling exploration of quantum physics as sokoban.

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