"21" is considered a very challenging game, especially because the offensive player must possibly go up against several defenders at the same time.

Thomas called it "the most challenging game I ever coached."

Play the challenging game, and use the learn more with additional resources.

That chip makes possible more challenging games, richer color and better sound than the current 8-bit systems.

They even come up with challenging games when the show is on a break.

It's time to move on to a truly challenging game.

But people of any age can play in this challenging game.

I'm all for a challenging game, but this is just cheap.

It is a very challenging game to learn and master.

Finding the trail was a challenging game of trial and error.