This Japanese play drawing its origin from the "Latin square" is in fashion in this moment. It is thus normal that we integrate it into our series of plays of bar. An article on Wikipédia will enable you to know some more about this puzzle with figures
Wikipédia, Sudoku
Recall of the rules: The goal is to fill the blank cells, a figure in each one, so that each line, each column and each area do not use several times the same figure. Figures going from 1 to 9. Good grid.