Letter Sudoku, also known as Word Sudoku or Alphadoku, is a variation of the classic Sudoku puzzle that uses letters instead of numbers. The rules for Letter Sudoku on a 9×9 grid are as follows:
1. The grid is divided into nine 3×3 sub-grids, also known as “boxes” or “regions.”
2. Each row of the grid must contain the letters A to I, with no repetition of letters within the row.
3. Each column of the grid must also contain the letters A to I, with no repetition of letters within the column.
4. Each 3×3 sub-grid must contain the letters A to I, with no repetition of letters within the sub-grid.
5. The puzzle starts with some letters already filled in, known as “clues” or “givens.” These letters are the starting point for solving the puzzle.
6. The goal of the puzzle is to fill in the remaining empty cells with letters from A to I, following the rules above, so that each row, column, and 3×3 sub-grid contains all the letters A to I without any repetition.
7. As with the classic Sudoku, there is only one solution to a valid Letter Sudoku, and it can be achieved through logical deduction without any guessing or trial-and-error.
Letter Sudoku provides a different and interesting challenge for puzzle enthusiasts who enjoy word-based puzzles.
