Here's how you can use the pattern to your advantage in your next Sudoku. A Sudoku is a puzzle involving a 9x9 grid into ...

The secret pattern hidden in your daily Sudoku ... 'The basic idea is that there are sets of cells in any Sudoku grid that must contain the same collection of numbers,' says Professor Hart.

There are more patterns here: every row, column, and 3 x 3 square therefore contains digits that add up to 45, for example.