worldly.

A world of possibility. In your browser.

Small script.
Whole world.

Make somewhere worth getting lost in.

A browser-based 3D engine for building worlds, making games, and seeing what happens next. Create by hand, in code, or alongside your AI agent.

Start building Explore the Hub

Browser native. Open source. Yours to make.

PROCEDURAL STUDYCANAL DISTRICT / 001
Street plan of a procedural city, with courtyards, parks and plazas.
A procedural city plan. Open the Hub to explore a playable world.

One seed. Endless possibilities.

Built for humans + agents.

Build it. Play it. Share a link.

01 / THE TOOLBOX

A little code.
A lot of world.

From the first patch of terrain to the last lap of a race. The pieces to make a place are also the pieces to make it play.

01

Worlds that grow from a seed

Lay roads, raise buildings, shape terrain, and scatter vegetation with procedural generators. Change the seed. Find somewhere new.

TerrainCitiesWater
02

Your editor is a browser tab

Move, inspect, script, and undo in a visual 3D workspace. Switch from Edit to Play and try the world you’re building, right where you made it.

Visual editorEdit / Play
03

An extra pair of hands. Or ten.

Connect an AI agent over MCP. Let it discover generators, write scene scripts, and work alongside you with visible presence in the editor.

Remote MCPAgent presence
04

Give your world something to do

Drive vehicles, sail boats, set quests, and connect triggers to game logic. Physics, characters, and positional audio bring the scene to life.

PhysicsQuestsGame logic
05

Better with other people

Publish to a playable link, meet in public rooms, and travel together in a party. The Hub and publisher arcades give your games a place to be found.

MultiplayerPartiesArcades
06

An engine you can build on

A shared runtime powers the editor and player. Extend it with the plugin SDK, inspect the source, or host the stack yourself. Your worlds remain yours.

Plugin SDKAGPL-3.0

02 / THINK IT. SCRIPT IT. WALK AROUND IT.

The world is
your source code.

A seed and a script make a world you can inspect, change, and generate again. Give your agent the same tools and see where the conversation takes you.

Explore the generator docs
Same seed + same script. Same place.
a-little-city.jsGENERATOR SCRIPT 
// Start with a few streets.
roads.cityGrid({
  blocksX: 8, blocksZ: 8,
  blockSize: 120, ringRoad: true
});
roads.blocks({ parkCount: 4 });

// Give them somewhere to go.
buildings.parcels({
  layout: "perimeter",
  minHeight: 9, maxHeight: 45
});
terrain.fill({ margin: 100, tile: 32 });
buildings.build({});
Connect your agent mcp.json
Remote MCP configuration 
{
  "mcpServers": {
    "worldly": { "url": "https://mcp.had3d.app/mcp" }
  }
}

Add this to a client that supports remote MCP, then approve access to your project.

03 / THE ROAD AHEAD

We’re building
a bigger playground.

Worldly is in active development. Here’s what you can build with today, and where we want to take it next.

BUILD WITH IT TODAY 01

The foundations are here.

  • Procedural worlds and a visual editor
  • Physics, vehicles, quests, and game logic
  • MCP tools and visible agent presence
  • Publishing, public rooms, and parties
  • Player profiles, inventory, and leaderboards
Make your first world

UP NEXT 02

More ways to play.

  • Round-based games, roles, and teams
  • Match queues and spectator flows
  • Combat progression and abilities
  • Crafting, building, and survival systems
  • Universes: carry what you earn from one game into another

Planned · gameplay depth

FURTHER OUT 03

A world of shared building blocks.

  • A shared library of reusable prefabs
  • A community plugin marketplace
  • A player exchange across each universe
  • Richer environments and larger worlds
  • More games made by outside builders

Exploring · the wider ecosystem

A direction, not a deadline. Priorities will evolve as people build and play.

04 / YOUR TURN

What will
you make?

A quiet canal town. A chaotic race. Somewhere no one’s been yet. Start with a little curiosity.

Free to start. No card required.
What’s included in the free tier?
Free tier limits per account
Projects 10
Scenes per project 20
Live publishes 5
Publishes per day 20
Asset storage 200 MB
Multiplayer peer-hours / world / month 50
Collaborators per project 5

Higher limits and metered credits are planned for later.

Open engine. Your creations.
Worldly’s code is AGPL-3.0-only. The worlds you build with it are yours.