"How did you find that?" Leo hissed.

"I was just trying to help people focus," he said finally. "The quiet kids. The ones who finish early and stare at the wall."

By Friday, Ms. Albright, the IT administrator, called Leo to her office. Her screen showed the network traffic. It looked like a normal heartbeat—until 2:15 PM, when a sharp green spike erupted. "Leo," she said, pushing up her glasses, "can you explain why Study.com received 2,000% more traffic from your Chromebook than from the entire math department combined?"

Check the "Career Cruising" portal. Password: firewall_fun.

Leo was a master of disguise. Not the kind with fake mustaches and trench coats, but the digital kind. To the school’s content filter, GoGuardian, he was just another diligent student researching quadratic equations on Study.com.

So, Leo built his own portal. A hidden HTML page, disguised as a citation generator. Click "Generate MLA Citation," and it would actually launch a proxy that streamed Kingdom Rush .