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 contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which typically has a unique solution.
There are a few online services that offer letter sudoku puzzles. These puzzles are similar to the classic sudoku puzzles, but instead of using numbers, they use letters. These puzzles can be a fun and challenging way to improve your problem-solving skills.
There are many online Sudoku services that can help you improve your skills and strategies. These services can provide you with a variety of puzzles to solve, as well as tips and tricks to help you improve your game. If you're looking for a challenging and fun way to improve your Sudoku skills, consider using one of these online services.