[_qulr]

The idea of a "language game" was merely an analogy. It wasn't meant to trivialize the subject. The point is that language is an activity that operates according to conventional rules. (This also relates to his argument against "private language", though I'm personally not as convinced by that.) If you were to give a short summary of Wittgenstein's philosophy, I think it's better to say that he claimed meaning is use. "For a large class of cases—though not for all—in which we employ the word "meaning" it can be defined thus: the meaning of a word is its use in the language." This is in opposition to traditional analytic philosophy which holds that the meaning is specified by external references and truth conditions.