Get ready to play one of the most popular puzzle games in the world. It is easy to learn and play. Use your intelligence to solve challenging puzzles and train your brain. Sudoku is just the puzzle you are looking for to improve your memory and logical thinking skills. In addition to the classic sudoku, which is played with classical numbers, there is also a mode played with letters. Language support for: English, German, Spanish, French, Italian, Dutch, Turkish, Indonesian Sudoku is a logic-based, combinatorial number-placement puzzle. In classic Sudoku, 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 (also called "boxes", "blocks", or "regions") 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.