Sudoku - is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called "boxes", "blocks", or "regions") contains all of the digits from 1 to 9. - Complete 300 puzzles, Easy/Medium/Hard - Random level generator, play as many as you want - Multiple light & dark color themes - Relaxing music