Sudoku Articles

Hidden Single is one of the most basic yet powerful technique for solving Sudoku. Mastering this technique alone would allow you to solve any Easy puzzle on Sudoku Mood. The idea is simple: choose a digit and a row, column, or 3x3 block. Then, check how many cells in the selected row, column, or block can contain that digit. If there's just one such cell, you can place the digit in that cell.

Let's begin with the idea of Naked Single technique. According to Sudoku rules, digits in rows, columns, and 3x3 blocks cannot repeat. This means a cell cannot contain any digit that is already present in the same row, column, or block. If an empty cell can contain only one possible digit, you can fill that cell with this digit.