From ancient song, all worlds are born.Yours is next.
Step in. Pick a feeling, and walk the world it builds around you.
One email when Thalyn launches on Steam. Nothing else — no list, no newsletter, no spam.
We store your address for this one purpose and delete it on request. See Legal.Pick a feeling — say it out loud, or type it — and walk a complete world Thalyn builds in minutes. No code, no 3D modelling, no piecing scenes together by hand.
PC · Steam · £19.99 · one-time purchase
"I placed assets for hours. The world still felt like nothing."
Nothing lands at random. Every tree, every path, every sightline is placed to serve the feeling you chose — so the world reads as deliberate the moment you step into it.
"I can picture exactly how it should feel. I just can't build it."
Choose how a place should feel, and everything answers to it — the land, the light, the air, the path under your feet. Six feelings to start from; the whole world resolves around the one you pick.
"Every world I make looks like everyone else's."
Change the entire look of your world in a single pick. Every surface, every texture, every object shifts at once — so what you make looks like no one else's.
A world that feels like somewhere.
The tools that exist make worlds that look like something — but rarely feel like anything. The terrain is technically correct. The assets are sharp. Yet walk through it and the space says nothing: no shelter, no sightline that draws the eye, no clearing that asks you to stay.
Thalyn starts from the other end. You choose how a place should feel, and everything bends toward it — the lie of the land, where things stand, the light, the air, the path under your feet. You step out into a world with intent, not a default.
This isn't a faster way to make a generic world. It's a different idea of what a world is for.
You bring the castle. Thalyn builds the kingdom.
Drop in your own model — a castle, a ruin, a monument, anything you already love — and Thalyn treats it as the reason the world exists. Terrain, paths and sightlines arrange themselves around it, so what matters to you sits at the heart of the world and stays reachable on foot. No model of your own yet? The day-one library has landmarks and hundreds of trees, shrubs and rocks to start from instead.
Deterministic, not generative.
Thalyn doesn't paint worlds with a diffusion model. It builds them with a rules-based generation engine, grounded in ecological and psychological research. The same seed always rebuilds the same world, exactly.
Share a seed and someone else gets your world, not an approximation of it. Return to something you made months ago and it's still there, unchanged. Nothing you build is at the mercy of a model version.
Why this exists.
I wanted to build a world without first learning three programs and a scripting language. I couldn't find a tool that let me, so I made one — and then spent a long time on why some places feel like somewhere and others feel like nothing at all.
What you make with it is yours, permanently. That part matters to me more than anything else here.
"Thalyn exists to give anyone the power to make a world that feels like somewhere — without code, without 3D expertise, and without compromise on how it should feel."
Your world is yours alone. And part of something far larger.
From ancient song, all worlds are born. · Ó Senchetel, Beirthir Cach Bith.
