My daughter Emily (aged 10) has come up with a fiendishly difficult treasure hunt based around Tunbridge Wells. It's at pseudosherlock.co.uk (twitter @pseudosherlock) and she is doing it to raise money for Sport Relief at the end of March when our family will be doing a 1 mile swim.

She has been sponsored by Sonic Games  who make impossibly fiendish puzzles and famously turned down a £200k offer on Dragon's Den. They've provided their famous Isis puzzle (RRP £170) and some books that have a hidden message in them which, if deciphered, have a $25,000 prize.

Only a £1 to enter and, bar one question which we are prepared to give a hint on, we don't believe you have to move from behind your computer.