These are multiplayer .io games hosted locally.
Modern github.io sites enforce HTTPS. Deep Packet Inspection (DPI) is expensive for schools; most rely on SNI (Server Name Indication) filtering. Because the SNI header says github.io (allowed), the encrypted payload containing the game passes through undetected. unblocked games githubio work
github.io is a domain owned by GitHub (Microsoft). It allows users to host static websites for free. Because GitHub is a legitimate, professional developer platform, network filters (like Securly, Lightspeed, or GoGuardian) rarely block the entire github.io domain. This creates a legal loophole. These are multiplayer