National Basketball Association teams play eight preseason games per year. Today, NBA teams almost always play each other in the preseason, but mainly at neutral sites within their market areas in order to allow those who can't usually make a trip to a home team's arena during the regular season to see a game close to home; for instance the Minnesota Timberwolves will play games in arenas in North Dakota and South Dakota, while the Phoenix Suns schedule one exhibition game outdoors at Indian Wells Tennis Garden in Indian Wells, California yearly, the only such instance an NBA game takes place in an outdoor venue.
What is the only NBA game that's played in an indoor venue?