If you use a proxy, disable scripts for the proxy site itself, and only enable them for the game frame. This is the most important question. Messcraft the game is safe. The problem is the ecosystem of unblocked sites.
This is where the search for begins.
Only play during approved breaks (lunch, free period, study hall). Running Messcraft in the background during a lecture will drain your battery and your GPA. Troubleshooting: Why Isn't Messcraft Loading? Even "unblocked" versions fail sometimes. Here is a quick fix guide: messcraft unblocked