Sudoku Cafe is a logic-based puzzle game to fill a 9x9 grid with numbers (1 to 9). Let's enjoy the simple puzzle game now! Once you start, time sure flies! How to play. The 9x9 playing board has nine 3x3 subregions. Each of the nine 3x3 subregion contains all of the digits from 1 to 9 with no duplicate numbers.