Here is the start of a six-part challenge. Can you get to the end and crack the final message?

Substitution and Transposition all in one! How fiendish can these codes get?

Six samples were taken from two distributions but they got muddled up. Can you work out which list is which?

Where do people fly to from London? What is good and bad about these representations?

A geographical survey: answer the tiny questionnaire and then analyse all the collected responses...

Is it the fastest swimmer, the fastest runner or the fastest cyclist who wins the Olympic Triathlon?

Match the cumulative frequency curves with their corresponding box plots.

Like all sports rankings, the cricket ratings involve some maths. In this case, they use a mathematical technique known as exponential weighting. For those who want to know more, read on.

Build a mini eco-system, and collect and interpret data on how well the plants grow under different conditions.

When Charlie retires, he's looking forward to the quiet life, whereas Alison wants a busy and exciting retirement. Can you advise them on where they should go?

Anna, Ben and Charlie have been estimating 30 seconds. Who is the best?

With access to weather station data, what interesting questions can you investigate?

You may like to read the article on Morse code before attempting this question. Morse's letter analysis was done over 150 years ago, so might there be a better allocation of symbols today?

Which countries have the most naturally athletic populations?

Find the frequency distribution for ordinary English, and use it to help you crack the code.

Can you make sense of information about trees in order to maximise the profits of a forestry company?

How do decisions about scoring affect who wins a combined event such as the decathlon?