a new ballgame

a (whole) new ballgame

a completely different situation The teenage world is a whole new ballgame for most parents.

Name	Pronounced	Usage
Berenice	bər-NEES (English), ber-ə-NEE-see (English), be-re-NEE-che (Italian)	English, Italian, Ancient Greek (Latinized)
JosÈPhe	-	French
Tod	TAHD	English
Ute	OO-tə	German
CÉLia	SE-lyə	Portuguese
Leanna	lee-AN-ə	English