Roblox has introduced Build, a new feature that lets people make games entirely inside the mobile app. Describe the game you want in plain language, and AI assembles a playable starting point for you. A public alpha begins July 28 in New Zealand, and participants who meet the requirements can publish what they make even at this early stage. Not needing a PC to start building is the biggest departure from how Roblox has worked until now.
One New Tab in the App Becomes the Workshop
Build sits in the Roblox app as a creation tab. Type something like "let's make a cozy adventure game set in a dense forest with environmental obstacles," and it generates a playable starting point from that description. You can test it on the spot, then ask for changes through chat until it feels right. Sharing it with friends for feedback works too, and so does taking it all the way to publication.
What gets generated goes well beyond visuals. Build handles gameplay mechanics, the environment, characters, visual style, and sound. Behind the scenes it draws on a broad mix of AI models, both open-source ones and models Roblox built itself. Because those in-house models are trained on an unusually large body of 3D models and gaming-specific data, Roblox says they can produce functional 3D objects and full 3D scenes that drop straight into its existing creation tools.
Continuous With Studio, So You Can Pick Up on Another Device
Roblox Studio, the company's PC creation tool, has been around for years. Build is not a separate product bolted on beside it. The two share a back end, the same models, and the same chat history.
That makes moving between them unusually fluid. You can rough out a structure on your phone during a commute and flesh it out in Studio once you are home. The reverse works as well: launch agents from Studio, then check on their progress from your phone while you are out. The underlying idea is to hand off the parts of development that do not need your full attention and spend your own time where judgment matters.
New Zealand First, Ages 9 and Up
The alpha is limited to age-checked users in New Zealand aged 9 and older. A selected set of features, including the ability to publish games, unlocks there. Published games reach a global audience only when the creator is age-checked and 16 or older.
Roblox plans to widen the regions covered over the coming months. On pricing, a base-level version of Build is free, with additional paid options for creators who want to push it harder.
Easier to Make Is Not the Same as Easier to Be Found
When anyone can generate a game, the obvious worry is a flood of low-effort output. Roblox has been direct about this: the quality of what appears on the homepage is not changing.
The company's discovery system ranks games by how well they retain players over time. Games made in Build enter the same candidate pool as everything else and are ranked by the same criteria. They pass the same safety checks, and before joining the Roblox Select catalog they go through the same extended review every Roblox game faces. Being able to make something and having people find it remain two separate things. In the company's own framing, if no one plays it, no one can find it.
Three Agents Are Coming to Studio as Well
Build is only part of the announcement. Over the coming months, Roblox will ship a suite of tools for professional creators that work across both Build and Studio.
There are three. A playtesting agent surfaces bugs before a single player encounters them. An analytics agent answers questions about a game in plain language, so creators do not have to dig through dashboards. An experiment agent identifies which tests to run to lift engagement, retention, and monetization.
Work on the 3D asset side continues too. Procedural Models, already available, generates parametric 3D assets from a text prompt or an image, letting creators reshape and refine by adjusting parameters rather than modeling by hand or regenerating from scratch. Cube, the company's 3D foundation model, turns a prompt into game-ready objects ranging from simple props to vehicles that drive and weapons that shoot. A scene-generation model that builds entire editable, playable 3D scenes from a single prompt is also in the works.
Summary
Build is Roblox's move to let creation start and stay on a phone: describe a game, get a playable foundation, and carry it into Studio when you want more depth. The public alpha opens July 28 for age-checked users 9 and older in New Zealand, with the base tier free to use. The notable part of the announcement is that while Roblox is widening who can build, it is holding the line on discovery, where rank still comes down to whether people keep playing.
