When you finally load that gray canvas, see your basic triangle tank spawn in the corner, and hear (in your mind) the first thump of your cannon—you haven't just bypassed a filter. You've reclaimed a tiny piece of digital autonomy.
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If the proxy servers are laggy (which often happens on school Wi-Fi), look for "Sandbox" unblocked versions. These allow you to play against AI-controlled tanks. The pros are zero lag and no risk of being dominated by a level 90 Booster rammer. The con is that it lacks the thrill of PvP. When you finally load that gray canvas, see