"No one has seen the answer key since my older brother was in fifth grade," whispered Tomi, pulling his hood lower.

She called Zsófi to the front. "Where did you get this?"

She smiled. Not a small smile. A real one.

The class held its breath.

She grabbed the dusty chalkboard eraser and slammed it on the desk like a judge's gavel. "Operation Munkafüzet is go."

They photocopied their handwritten answer key and stapled it into the back of every workbook.

And from that day on, the fifth graders of Árpád Elementary never looked for an answer key again. They became the key.

It was a gray Tuesday morning in Budapest, and the fifth-graders of Árpád Elementary were in a quiet panic. Their math teacher, the legendary Mrs. Kovács, had declared a surprise quiz the next day. But the real problem? The "Matematika 5 osztály munkafüzet" – the dreaded blue workbook – had a secret section at the back: "Megoldások" (answers). And someone had torn it out years ago.