Unity Spark vs OrigoZero: make a 3D browser game with AI today

Today, 7 October 2026, Unity and Google announced Unity Spark: describe a game in your browser, refine it with an AI agent in a web editor, publish it and share a link. That is a good day for anyone who wants to make games. It is also a description of what OrigoZero already does, and you can use OrigoZero right now. This post sets out what Unity has announced, what OrigoZero ships today, and the eight games one person built on OrigoZero in the last three days.

What Unity Spark is

Spark is an AI game maker that runs on Unity's engine in the browser. Unity's CEO wrote why they built it: for players who know a genre inside out, artists who can't code, and modders. From the launch coverage:

• It is not out yet. The page has a waitlist, and Unity and Google say a closed beta is coming later this year.
• Games will be published on Playground, a new Google platform. Google's announcement says Playground is open to adults in the US, and GamesIndustry.biz reports that Spark will also be 18+.
• The editor runs in desktop browsers. Finished games play on desktop and mobile browsers.
• Several people can edit one game at once from a shared link, the agent can pull art from the Unity Asset Store, and several agents can work in parallel.
• Pricing isn't set: some free credits tied to AI tokens, then paid credits.
• GamesIndustry.biz reports that at launch you won't be able to download a project, export it to desktop Unity, or sell what you make.

Unity has said you won't need to write code. It hasn't said whether you'll be able to see or edit a game's scripts.

What OrigoZero is

OrigoZero is the platform. Zero is its game engine, and it runs in a browser tab on WebGPU. You describe a game at origozero.ai/create, an AI agent builds it live inside the Zero engine while you watch, and you publish it to a link that anyone can open and play, on a computer or a phone. Every world is Luau code and data that you can open and edit. Worlds can be multiplayer, anyone can fork a published world, and a fork can send its changes back to the original's author as a pull request with a real three-way merge. The terms say you own what you make, and your published worlds stay available to you through the pull command and the API.

Side by side

	OrigoZero	Unity Spark (as announced)
Can you use it today?	Yes	Waitlist; closed beta later in 2026
Who can sign up	Anyone 13 or older	18 or older; Playground opened in the US
Where you build	Any browser with WebGPU, phone included	Desktop browsers
Engine	Zero, in your browser tab	Unity's runtime, in your browser
Price	Free plan with 200 credits a month; paid plans from $20	Free credits, then paid credits; not finalised
Assets	The agent generates them: 3D models, animation, textures and materials, music, sound and voices	Unity Asset Store items made by artists; AI models not named
The code	Luau you can read and edit	No code to write; whether you can read it is not announced
Sharing	A link, multiplayer, forks and pull requests	A link on Playground and real-time co-editing; Playground offers leaderboards and multiplayer in some genres

Assets made for your game, not picked from a store

Unity's pitch for Spark is that it "connects directly to the Unity Asset Store", so you build with models and art that artists have already made. That is a large library of good work, and it is shared by everyone who builds with it. GamesIndustry.biz reports that Spark will also use several generative AI models, which have not been named or described.

On OrigoZero the agent makes the assets for your game. It can generate:

• 3D models from a sentence or a picture, rigged into characters you can animate
• animation for those characters from a description
• images, textures and full PBR materials
• music, sound effects and spoken lines
• whole scenes you can walk through, from a description
• shaders, which it writes as code

lumi's games below were made this way. Amelia's world page says all of its art, music, names and places were generated for that game, SURF VOID has a generated synthwave soundtrack, and Church is on Fire burns with its own wood-fire shader. A generated asset is part of the world, so anyone who forks the world gets it too.

Eight games from the last three days

Between 5 and 7 October, lumi built these eight games on OrigoZero with Claude Code running Opus 5.5, connected to the Zero engine. Every commit in them was made by the agent. Each one is published and playable in your browser now. The same engine tools are open to Codex and other MCP clients, and the site's own chat agent needs nothing but an account.

Luminaria is a 3D light puzzle game inside a hollow mountain. Mirrors bend beams, prisms split white light, stained glass strips colours out, and you mix them back into magenta, cyan, yellow and white to wake the Sigil Locks, six chambers down to the Heart of the Mountain.

Amelia is an HD-2D fantasy JRPG: pixel-art heroes in a lit 3D diorama with tilt-shift and bloom, three areas, two companions to recruit, and turn-based battles with weaknesses, extra turns and a two-phase boss. It is the biggest of the eight, at 571 assets.

Church is on Fire gives you three matches, a lantern and some kindling on Halloween night in a Norwegian fjord valley. Read the wind and the damp, burn down a procedurally generated stave church, and get a grade. Every round is a new church and new weather.

In the Wire is the prologue of a wireframe horror story with turn-based combat, set in a dying 1999 memory archive where something is colouring people in.

Toddler of Duty is a deadly serious military shooter in which every soldier is two years old: stick rifles, pinecone grenades and five-a-side team deathmatch in the backyard.

SURF VOID is a Counter-Strike: Source-style surf map rebuilt from the movement up, with six ramp stages over a sunset void and a timer to beat.

Spooky Spook Spook is a physics roguelite: you are a skull in a crypt, and you bolt the bones of what you smash onto yourself.

Sneaky Pooper is a stealth comedy across three pools. We will let the title explain it.

There is more on how an agent works in the engine in making a game with Opus 5.5.

Why build on OrigoZero instead

You can start now. Spark is a waitlist. OrigoZero is a page you can open today, and the games above show that it builds real ones.

You can build on your phone. The agent builds inside your browser, so if your phone's browser has WebGPU, you can describe a game, play it and change it from there.

The code is yours to read. A world is Luau and data. You can open any script the agent wrote, change it by hand or ask the agent to change it, and learn from a game that already works.

Building on other people's work is built in. Fork any published world, change it, and send your changes back to its author as a pull request. A whole world can also be used as a library in yours, pinned to the version its author published.

The agent checks its work. It plays the world, reads the errors and fixes them before handing it to you, and a world will not publish while any of its scripts is broken.

Where Spark may suit you

Spark has real strengths. If you want the Unity Asset Store's art, several friends editing one game at the same time, or the leaderboards and matchmaking Google and Unity describe for Playground, those are part of the announcement. It is also made by the company behind one of the most used engines in the world. When the beta opens, try both.

Try it

Describe a game and watch the agent build it. The free plan includes 200 credits a month, and publishing costs nothing.