Sudoku game with thousands of different puzzles, from very-easy to super-hard!
Sudoku is sometimes incorrectly spelled as suduku, suduko, sudoko, soduku, soduko, sodoku, sodoko.

Su Do Ku, "single number", Japanese skill and mind game which is a logic-based number placement puzzle. The objective is to fill a 9×9 grid so that each column, each row, and each of the nine 3×3 boxes (also called blocks or regions) contains the digits from 1 to 9, only one time each (that is, exclusively).