"Consider the vertices as residues mod 3. The triangles are not formed by lines, but by the vanishing points of perspective. Answer is not 'none of these.' Answer is 108. Tell Dhruv."

"If you are reading this, you are in the recursion. Close the file. Do not solve the last problem. The last problem solves you."

Rohan’s blood went cold. Dhruv was his roommate. Dhruv had been gone for six months. He had taken the JEE Advanced two years ago, failed, and then… just left. No one knew where. He stopped answering calls. His parents filed a missing person report. The last thing he ever said to Rohan was: "The problem isn't the solution. It's the path. If you find my copy of Das Gupta, don't open it."

He tapped search.

Rohan’s mouse hovered over the final problem number: 999. He hadn't even reached that chapter in the book. But the PDF had a direct link. He clicked.

He scrolled to problem 417.

And on the hostel corridor wall, written in chalk, was a single solved equation:

"You searched for solutions, Rohan. But some equations have only one real root. And you are it. Turn around."