Sudoku Soft-Book

Sudoku is a recently popular number puzzle game from Japan. You need to fill the grid with numbers in such a way that all rows, columns and 3x3 squares have all digits (1-9). <br> This Sudoku softbook offers you about 50,000 puzzles in 12 books. You can play 3 different sudoku games, Regular sudoku, Killer sudoku and Greater than sudoku.