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