Improved support for Diagonal or X-Sudoku
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Sudoku-X [Help and suggestions for Sudoku Dragon program forum] contributed by XMAN1377
I have found Sudoku-X or Diagonal Sudoku to be a very challenging variation of traditional Sudoku.
I would like to see a Theme Design where the diagonals are assigned an user defined optional color or other signifigant identifier to make them easier to see in the grid.
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