The only choice, which one must accept for want of a better one. For example, Out here, this bank is the only game in town when it comes to financial services. This term, dating from the early 1900s, originally alluded to a gambler looking for a game in a strange town.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.