The idea is to see who can climb the highest on the most difficult routes.

You must have taken a more difficult route than mine.

There are more difficult routes for the rider who wants a challenge.

It had taken two years to complete this short, but difficult route.

The west and south faces of the peak offer more difficult technical routes.

But Hill sees no reason that the most difficult routes should not be climbed by women at the same time as men.

But why take such a difficult route to charitable giving?

But it is a difficult route, especially for someone like yourself.

The 108 is considered to be one of London's most difficult routes to operate.

However, it came to be known as a difficult route because of its steep climbs.