Sudoku is a popular number-based puzzle game that challenges logical thinking. Originating in the late 20th century, it has grown into a global phenomenon, appearing in newspapers, mobile apps, books, and websites. This online HTML5 game was developed by Nicolai Jaeger at McZak.The goal of Sudoku is to fill a 9x9 grid with digits (1 to 9) in such a way that fulfills the following rules:

• Each row contains the digits 1 through 9 without repetition.
• Each column contains the digits 1 through 9 without repetition.
• Each of the nine 3x3 subgrids (also called regions or boxes) contains the digits 1 through 9 without repetition.