a completely different ballgame
a different ball game
a whole new ballgame
a whole new ball game

The product seemed very competitive, and the only thing missing was good marketing (Marketing to businesses is a completely different ballgame).

"Psychologically, being concertmaster is a completely different ballgame.

Mr. Evans noted that if fuel prices had remained where they were at the beginning of 2004 - or better yet, in the middle of 2002 - then, "it would be a completely different ballgame."

"It's a completely different ballgame when you can make a living," said Rowdy Gaines, a former world-record holder and winner of three gold medals at the 1984 Los Angeles Games in swimming.