Nothing like a little tussle with an intellectual problem to clear the troubled mind.

So you're really concentrated on artistic, technical and intellectual problems.

You have a genuine interest in and talent for intellectual problems.

I can hardly imagine a more difficult intellectual problem.

This may indicate an intellectual problem that did not manifest itself on the initial screening.

"You posed an intellectual problem, I helped to solve it."

The dragon handed it back to her, distracted by the intellectual problem.

To him, however, this was merely an interesting intellectual problem.

"It's been nice for those who could take this all as an intellectual problem, but I haven't been able to do that."

"It is the most interesting intellectual problem," she said.