In 2008, a clock-based version was used in the US (though it has now been replaced by the "shuffle" format). Subsequently, the clock was adopted in Japan (2009) and the UK (from August 2010), where it still continues. Another country has recently adopted it. What is this about?
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The format in
"Who Wants To Be A Millionaire". Kaun Banega Crorepati 4, which began in India this month, uses a timed Q&A format for part of the quiz, like the UK, while the Japanese version uses the clock for all questions.