The correct answer is: no article.
The word "game" is a common noun, which means that it refers to a general class of things, not a specific thing. Common nouns are not usually preceded by articles.
In this case, the speaker is not referring to a specific game, but rather to the general concept of a game. Therefore, the article "a" or "an" would not be appropriate. The article "the" would also be incorrect, because it is used to refer to a specific thing.
Therefore, the correct answer is "no article."
