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These are simple HTML5, JavaScript, or Flash-based games hosted on GitHub Pages (free static web hosting). Students and gamers used them to bypass school or work firewalls because: github io games unblocked patched
To understand the "unblocked patched" phenomenon, you first have to understand the platform. GitHub Pages (ending in .github.io ) allows developers to host static websites for free. It was originally intended for portfolio sites and open-source documentation. However, because it is a legitimate developer tool, most school and workplace firewalls are hesitant to block the entire github.io domain. Doing so would cut off access to vital coding resources. The Ultimate Guide to GitHub