Currently, major league teams playing two games in a day usually play a "day-night doubleheader", in which the stadium is emptied of spectators and a separate admission is required for the second game. However, such games are officially regarded as separate games on the same date, rather than as a doubleheader. True doubleheaders are less commonly played, and usually are of the "twi-night" variety. Classic doubleheaders, also known as day doubleheaders, were more common in the past, and although they are rare in the major leagues, they still are played at the minor league and college levels.