From the launch of SmileTV until 1 July 2006, Quizworld was shown in the 1 am to 4 am timeslot. Quizworld was a premium rate telephone quiz service. An audio version of Quizworld was also broadcast on Top Up TV Active intermittently outside of SmileTV's broadcast hours. The audio on was accompanied by an on-screen MHEG graphic of the quiz. A MHEG graphic was used as during the daytime and evening Top Up TV had no space on the platform for an additional videostream.
