To block an application from accessing the internet using Windows Defender Firewall, follow these steps: Open Windows Defender Firewall on your PC. Click on the Advanced settings option.

You can now detect and block harmful third-party apps using Windows Defender Antivirus, and in this guide, we'll show you how to do it on Windows 10.

If you want to block the Roblox website or app, or prevent Roblox from being downloaded on your Windows 11/10 computer, see this post.