In 2025, Microsoft has pushed harder for account migration and server-side authentication, making true multiplayer clones harder to maintain. However, the single-player WebGL versions from 2021 still survive on thousands of archived GitHub forks.
They often supported multiplayer servers specifically for the unblocked community. minecraft unblocked githubio 2021
The page says "404 Not Found."
Some schools eventually caught on and blocked github.io entirely. If that happens in 2025, try these alternatives that used the same 2021 codebase: In 2025, Microsoft has pushed harder for account