Customers who do not confirm how old they are or are underage will have web content filters turned on automatically.
Roblox said safety was a top priority and it had advanced safeguards in place to keep users safe.
A woman has been awarded $6m in a verdict that could have implications for hundreds of other cases in the US.
The ruling could be the beginning of the end of social media as we know it, writes the BBC’s technology editor Zoe Kleinman.
US District Judge Jane Boyle said the company had failed to show it had suffered any harm under federal competition laws.
A federal judge told the government it could not immediately enforce a ban on Anthropic’s tools.