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If you want the thrill of sneaky browser gaming – go ahead, but use a VPN or your phone’s hotspot, and through an unblocked clone. Final verdict on minecraft.unblocked.github : A treasure map that might lead to diamonds… or a creeper. Read the repo, check the files, play offline first. And when in doubt – compile it yourself from source. Happy (safe) crafting.
If you just want to or build – use the real Minecraft Education Edition (often allowed) or try Minetest (open source, portable).