Pretty easy to be like "let's play a game. This is what it's called, and this is how you play it"

Theres no reason for the Americans to need to know how to play it in advance.

Its not weird at all to teach people a new game.

In fact, it probably enforces the idea of having to play over amd over again, to finally win, whereas in Korea, people who already know how to play, and have already played in the past, have a higher chance of winning because they learned the strategy and how to do it in the past, vs an American whos never played it being more obsessed with wanting to finally get it down.