What came to mind after the first time the phrase ” That’s a whole new ball game ” was used? As JavaLatte mentioned, this is more common in AmE than BrE. In tennis, a “ball game” is defined as a certain state of affairs (or situation).

Oh, you want ME to guide you down the Death River so you can skip booking someone else to guide you they can do it for you. When will you end up on Death River? What is a ball game?

If you wanted to talk about how something was completely different from something else, you might use “a different ball of wax”. The is usually used when something might seem the same, but is actually really different. Melissa Etheridge

was not a new parent at the time when her twins were born; at that moment, she had a dream of becoming a parent herself. She was a novice.

If her new additions are a ball of wax then the whole thing will turn out to be “a whole different ball of wax.” ” ( Source )

” ( Source ) “How) do you explain my thought to someone who “is confused or confused?