Several websites host JavaScript or WebGL versions of Minecraft. While many of these sites offer "Minecraft Classic" (the very old version), some specialized "unblocked games" sites host wrappers for version 1.9. No download required; works on Chromebooks.
Browser-based Minecraft is memory-intensive. Minecraft Unblocked 1.9
Minecraft Unblocked 1.9: How to Play the Combat Update Anywhere Several websites host JavaScript or WebGL versions of
If you have access to a USB drive, you can use a portable launcher (like certain open-source launchers). By installing the game onto the USB drive at home, you can simply plug it into a school or work computer and run the executable directly. Since the game files are on the thumb drive, they don't need to be "installed" on the restricted computer. 3. Proxy Sites and Mirror Links Browser-based Minecraft is memory-intensive
Set it to 6 or 8 chunks to reduce CPU strain.