What looks like simple "circles hitting a circle" involves complex mechanics like "wall bouncing," "poking," and "curving."
fps drop on every browser · Issue #1995 · haxball/ ... - GitHub unblocked haxball
Developers are now creating "P2P" (peer-to-peer) versions of HaxBall that use WebRTC instead of central servers. These are essentially unblockable because the connection goes directly between two students' computers. As network filters get smarter, game mirrors get sneakier. It’s an arms race, and for now, the players are winning. What looks like simple "circles hitting a circle"
Here are historically reliable methods (as of this writing—URLs change often, so verify safety with an ad-blocker): and for now