Solve the puzzles and work your way around the book - but if you go wrong you are instructed to punish yourself. Of course you're hardly likely to do things such as tipping cornflakes into your pants if no-one is watching you are you? However... once you've solved every puzzle the book tells you how to sabotage it so that nobody else can complete it! You then pass it over to your worst enemies and make sure that THEY DO suffer all the forfeits!
Kjartan Poskitt is an author and TV presenter who is best known for writing the Murderous Maths children's series of books. Poskitt was educated at Collingwood College, Durham. In addition to his popular science and maths books, which include books on Isaac Newton (Dead Famous: Isaac Newton and his Apple), puzzles, practical jokes and secred codes, Poskitt has written a book of magical tricks, a GCSE Maths support book and four Rosie and Jim annuals. In 2007, Poskit published the first in a new series of children's novels called Urgum the Axeman.
He also wrote the theme tune for the children's art program SMart, as well as the title theme and music for the first two series of Brum. He is also the creator of a logic puzzle, Kjarposko.
He has been a presenter for a number of (mostly BBC) educational children's TV shows.