Welcome to English in a Minute.
Have you ever heard this American English phrase?
What's the game plan?
This expression is very common in American English. But it does not have anything to do with playing a game. It's a way to ask for information.
A: So what's the game plan? What are we doing tonight?
B: We're not sure yet. What do yo want to do?
When you say, "What's the game plan?" it's another way to ask someone for the details of a plan. It's the strategy for accomplishing something.
In sports, a game plan is a set of instructions for the players to follow, so they can win the game. Outside of sports, it could be a plan for going to dinner, seeing a play or even watching a game.
And that's English in a Minute.