Cecelia thought about it, drawn into the intellectual puzzle despite herself.

Some cases, the easy ones, were solved by it like an intellectual puzzle.

For others, it can exercise the same attraction as any complex intellectual puzzle.

The intrinsic fascination of an intellectual puzzle had brought him to this interview.

You've got a huge intellectual puzzle here in front of you - how do you regulate a free press?

What greater intellectual puzzle can there be than dealing with nature on its own terms?

"Not likely," said Wayne, though he welcomed the challenge of an intellectual puzzle.

"You have got a huge intellectual puzzle here", he told Leveson.

It may be a mere intellectual puzzle to you, but it is life and death to me!

That you're intrigued by these actions, not just as an intellectual puzzle.