The term "unblocked" usually describes browser-based clones or "cracked" launchers designed to run on restricted networks.

or just nostalgic for a time before the Nether was overhauled, here is everything you need to know about Minecraft 1.12. Why 1.12 is the "Gold Standard" for Unblocked Play

If it works, you'll be teleported to a floating track with checkpoints, competing for the best time using only an elytra and fireworks.

Risks and downsides

Play smart, build big, and happy mining. Just remember to tab out of the game when the teacher walks by—the ESC key is your best friend.