The activity for today is Sudoku.
Sudoku originally called Number Place, is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid (also called "boxes", "blocks", "regions", or "sub-squares") contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a unique solution.
[Source: http://en.wikipedia.org/wiki/Sudoku]
Members are given 3 sets of sudoku and the challenge is to complete within an hour.
