The phrase "a difficult route" is correct and usable in written English.
You can use it when describing a path or course of action that is challenging or requires significant effort to navigate.
Example: "The hikers decided to take a difficult route up the mountain, knowing it would test their endurance."
Alternatives: "a challenging path" or "a tough course."
It'll be a difficult route to take, but it will eventually bear fruit.
It would be a difficult route for any owner to take, however.
Should the amendment pass, it would still be a difficult route for the bill through the Commons in the face of government opposition.
It is the first ascent of such a difficult route in the Himalaya and the climb is said to have rescued Whillans from his demons.
Next weekend, though, regulators, legal experts, business representatives and government officials will try to take a first step in what is expected to be a difficult route toward a standardized global antitrust review process.
When he was done, he tied himself into his harness and set off up Mad Dog, a difficult route marked by small blue plastic holds set far apart on the wall.
Mr. Cuomo said at the time that he would collect signatures to get into the primary; it is a more difficult route, though there was never any real doubt that a candidate with Mr. Cuomo's name recognition and multimillion-dollar campaign treasury would be able to pull it off.
The coast between Egersund and Flekkefjord would give a very difficult route to build, so it was decided to build a more inland line.
They were roped together on a technically difficult route up the face of the 13,173-foot Dôme des Écrins when they fell.
The problem is that the supporting industry just doesn't exist in the UK anymore, so it's a very difficult route back".
To find out what is really going on under the pages of many Web sites and the third-party ad networks they work with, however, users would have to take a more difficult route - reading the privacy policy for each Web site in detail.
