Roblox's new AI tool Build generates playable games from text prompts, bringing vibe coding to mobile. Testing starts July 28 in New Zealand. The move pressures Microsoft and Google in the race for user-generated game creation.
Roblox on Thursday introduced Build, an AI-powered tool that turns a plain-language prompt into a playable game inside the mobile app. The tool pushes what some call vibe coding – describing software in natural language and letting AI generate the underlying code deeper into the video game industry.
The feature puts Roblox in a growing field of AI game generators. Google has Genie 3. Microsoft has WHAM, an internally tested tool. The race to lower the barrier for user-generated content could reshape how games are made and consumed, particularly among younger players who use mobile as their primary device.
Build also tightens the link between Roblox’s creation and consumption sides. Since 2006, the company has hosted millions of user-made games built in Roblox Studio. Build moves a simplified version of that workflow into the same app players already use, potentially expanding the supply of new games on the platform.
The company starts testing in New Zealand on July 28. The initial rollout is limited to age-verified users aged 9 and up for creation, with published games available to users 16 and older under age checks. A free basic version will be available; paid tiers are planned.
The bet is that AI generation can compress the time from idea to playable game. If it works, Roblox stands to capture more player time and reduce the friction that keeps casual users from becoming creators. The competitive landscape is narrowing. Larger platforms with established AI pipelines could replicate the model. The quality ceiling of AI-generated games remains an open question.
Roblox’s move is the clearest signal yet that the next battle in gaming will be fought over who owns the creation layer. Microsoft’s WHAM tool and Google’s Genie 3 show that the largest tech companies are chasing the same premise: let anyone build a game from a phone. Roblox got there first with a public launch date.
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