In the third and fourth season, the only challenge was the invention test.

"The only challenge is we are not going to create any new programs," he added.

A single tower was the only challenge to be found.

My only challenge now was to relax for two and a half hours.

It might be the only challenge that Jones has left.

And the question of tone is not their only challenge.

With that out of the way, man has turned to the only challenge left.

The only challenge was deciding where to make the kill.

The encounters with the new Government are not the only challenge.

"The only challenge for me was getting the guys to really believe," Riley said.