6/6 Clare Balding is joined by comedian Bill Bailey as five finalists fight it out.
5/6 Contestants chase for the last place in the 50,000-pounds final.
4/6 Six more contestants tackle a series of challenges to win a prize of £50,000.
3/6 Tasks include racing to be the first to solve the puzzles inside identical rooms.
2/6 Tasks include a number puzzle featuring acrobats on a giant trampoline and Stop the Clock.
1/6 Six contestants' emotional intelligence and ability to multitask are put to the test.