Since you began this sudoku puzzle, an area of the deep sea floor equivalent in size to 0 football fields has been destroyed by bottom trawlers in international waters. [Find out more] [Take Action ]
Sudoku , also known as Su Do Ku, Number Place or Nanpure, is a logic-based placement puzzle. The aim of the puzzle is to enter a numerical digit from 1 through 9 in each cell of a 9×9 grid made up of 3×3 subgrids (called "regions"), starting with various digits given in some cells (the "givens"); each row, column, and region must contain only one instance of each numeral. Completing the puzzle requires patience and logical ability so if you can work out that bottom trawling is a bad idea, sudoku should be easy too.