We found our way around Washington, D. C. , without getting lost, but New York City is a whole new ball game.
Alice： School is very different from the real world. It's a whole new ball game.
We're into a whole new ball game.
I used to be a teacher, so being a salesman is a whole new ball game for me.
He finds himself faced with a whole new ball game.
"This opens up a whole new ball game in nonlinear interferometry," he adds.