the only game in town

The only game in town is a phrase usually referring to there being just one of its type, no matter what it is referring to. This isnt necessarily used as a literal term for an actual game or sport, though sometimes it is used to describe the only game or sport in town. Typically, it is used figuratively in that no matter what you are referring to, it is the only one. It might be another type of recreational activity or something entertaining for people in town.