What puzzle, meaning 'single number' in Japanese, requires the completion of a grid so that each column, row and 3x3 box contain the numbers 1-9?
Brain Age: Train Your Brain in Minutes a Day! a Sudoku mode, which features more than 100 puzzles across three different modes – Beginner, Intermediate, and Advanced. Sudoku involves a 9×9 grid with numbers in every square. Some of these numbers are visible, while others are not. The objective is to fill in the hidden numbers using the visible numbers as hints. Each row, column, and 3×3 grid has nine squares in it, and each must contain each number in the range from 1 to 9. Many neurologists recommend the game for prevention of dementia/Alzheimer's. Nintendo of America has refused to support any scientific claims to the benefits of
Futoshiki Solving the puzzle requires a combination of logical techniques. Numbers in each row and column restrict the number of possible values for each position, as do the inequalities. Once the table of possibilities has been determined, a crucial tactic to solve the puzzle involves "AB elimination", in which subsets are identified within a row whose range of values can be determined. For example, if the first two squares within a row must contain 1 or 2, then these numbers can be excluded from the remaining squares. Similarly, if the first three squares must contain 1 or 2; 1 or 3;