Tic-tac-toe, also spelled tick tack toe, and alternatively called noughts and crosses, X’s and O’s, and many other names, is a pencil-and-paper game for two players, O and X, who take turns marking the spaces in a...
Sudoku is a highly addictive and fun logic-based number-placement puzzle. The objective is to fill a 9 by 9 grid with digits so that each column, each row, and each of the nine 3 by 3 sub-grids that comprise the grid (boxes) contains all of the digits from 1 to 9. The...