More than 5000 Sudoku puzzles. The best brain training board game. Sudoku puzzles from easy to expert modes. Download Sudoku Puzzle for free now. 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 contain all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a single solution.