GitHub.io games are browser-based experiences hosted on GitHub Pages, often referred to as "portable" because they no installation
Static Hosting: Leveraging GitHub Pages to serve HTML5 and JavaScript games without a backend server [3, 4]. games githubio portable
victordibia.github.io/hotseat – Hot-seat chess, checkers, and card games. One laptop, multiple players.If you are looking for games to download onto a USB drive (truly "portable"), GitHub is a massive host for open-source projects and "source ports" of classic games. GitHub
I have uninstalled the native clients for Hearthstone, League of Legends, and Genshin Impact from my work laptop. IT policies aside, the friction was too high. Example: victordibia
Several developers maintain comprehensive lists of playable games directly on GitHub: