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: Most school and office networks trust GitHub for educational and development purposes, leaving the .github.io subdomain open. No Downloads Required : All games run in HTML5 or WebGL directly in your browser. Clean Experience
Because GitHub is a legitimate educational and professional development tool, most school and workplace firewalls cannot block the main github.io domain without disrupting actual work or research. Game developers and students utilize this loophole by uploading open-source games (like clones of Agar.io , Snake , Slope , and Tetris ) to these repositories.