What cause drove her up such a difficult climb, he wondered?

The drop from the ledge was not quite sheer, but it would still make a difficult climb.

It was, as elsewhere on this face, a difficult climb but not impossible.

Feeling the walls all around to find places to grab, he started the difficult climb.

It had not impressed me as a difficult climb, but the events of the last few days were making themselves felt to me.

Despite its relatively low elevation, it is a difficult climb.

It was a difficult climb, holding the two of us.

Even with the moonlight to help them, it was a difficult and frightening climb.

A difficult climb was the only way to the top.

At high tide access is a difficult climb down the cliff.