Another example:

letters and words are toys (words have no "it-is-to-be-used-in-this-way": see dada, which is unstructured play)

language is a system, our discussion is play (structured play, we have goals, to explain, but no over-arching goal: to win, that is why such behaviour can be considered rude [not implying anything btw]),

and if we had a judge who'd score us, then we would have metrics and we can then have an over-arching goal (to defeat the other side with arguments) and it would be a game called debate. (In case of public debates, the public is the judge, with the resulting votes being the metric.)