Child Genius vs Celebrities Christmas Special
The first two rounds of the contest are all about language skills, as the kids battle to master old English and to spell some of the most complicated words in the English dictionary
This time it's all about maths, as the competitors demonstrate extraordinary feats of written and mental arithmetic, while also facing an intriguing twist in the rules
The 14 remaining competitors take on geography, facing a fiendish memory round of flags and another twist in the rules
It's the quarter-final and the contenders take on science and some of the world's most complex principles. There's also a triple-point question offering big gains or big losses.
Several competitors face elimination in a semi-final featuring nerves, illness, hugely demanding anagrams and some sudden death spelling
The child geniuses tackle their specialist rounds, including epidemiology and cryptoanalysis. The last two then go head to head in a quick-fire round. Who will claim the trophy?
Jimmy Carr, Rick Edwards, Charlotte Hawkins and Shazia Mirza take on four formidably talented Child Geniuses in a battle of young versus not so young. Can the celebrities outwit the geniuses?