In case you don't already know Sudoku (Number Place or Nanpure) is a number-based puzzle in which you have to fill in the empty boxes with the "missing" numbers using nothing more than logic and occasionally an educated guess. Each 3x3 grid and each complete row and column must contain all the numbers from 1-9 with no repeats. Despite initial appearances you don't need any arithmetic skills just a logical brain that can figure out where those numbers should fit to complete the whole grid. Suduko has already achieved enormous popularity in Japan and the UK and is spreading rapidly around the globe. Join in the fun here at Sciencebase thanks to Play-Sudoku.de. Place your cursor in an empty box and type in your first number. You'll be hooked with that first click.