How do you make a Sudoku in Word?

How do you make a Sudoku in Word? The basic rules are the same as regular sudoku, but with letters instead of numbers: fill every row, column and 3×3 region with each given letter exactly once. The interesting twist in Wordoku is that the diagonal cells from top left to bottom right should spell a common english word.

The basic rules are the same as regular sudoku, but with letters instead of numbers: fill every row, column and 3×3 region with each given letter exactly once. The interesting twist in Wordoku is that the diagonal cells from top left to bottom right should spell a common english word.
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