"Mastermind" then moved to Discovery Channel hosted by Clive Anderson in 2001. With Discovery Channel having commercials, this shortened the amount of time available for the answering of questions and lasted just one series. This was also the first to go 'interactive'. By using the red button viewers could play the general knowledge section throughout the series. These questions had been written specifically to afford both standard and multiple-choice format in presentation. There was a one-off competition between the four highest scoring viewers.