Everyone can try a few sudoku puzzles for free, but Apple News Plus subscribers ... you have to place the numbers one to nine into a square 9x9 grid. There are nine 3x3 blocks within that grid ...

But when it comes to boosting brain power, which one is better? Sudoku is a logic-based number puzzle played on a 9x9 grid. The objective is to fill in the grid so that each row, column ...