Short description of Sudoku Soft-Book 1.0: 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.