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Sudoku Puzzles with Symbols and two-digit NumbersThe MaaTec Sudoku program allows
  to change the characters that are used to display Sudokus with the Standard
  board and for printing Sudokus. But it is only possible to use single digits
  or letters per cell. To print Sudoku puzzles with two-digit numbers nonetheless,
  you can download a special TrueType font from the MaaTec
  Sudoku Boards page. This font contains two-digit numbers instead of capital
  letters and some symbols instead of small letters. 16x16 and 25x25 Sudokus with two-digit Numbers Download the MaaTec Sudoku font and copy it into the Windows font directory
  (usually 'C:\Windows\Fonts). Following open the Settings dialog via the Edit
  menu of the Sudoku application and choose the 'MaaTec Sudoku' font as 'Font
  for Standard Board'. If the default settings were not changed and the text
  box for the characters for large Sudokus contained capital letters, you can
  already see two-digit numbers here. Otherwise you need to enter the capital
  letters from A to Y as the first 25 characters for the large Sudokus. If you
  now print or play Sudokus on the Standard board that are larger than 9x9, you
  will see two-digit numbers instead of letters. If you just want to play 16x16
  Sudoku puzzles with numbers but not print them, you can also download the corresponding
  board and pieces graphics from the Boards page.
 4x4 and 9x9 Sudokus with Symbols You
  can use the MaaTec Sudoku font (see above) also to print Sudokus that use symbols
  instead of digits. After selecting the font in the Settings dialog,
  you will additionally need to change the 'Characters for Sudokus up to 9x9'
  to the small letters from a to i. Now you should see the symbols in
  the text box and you can use them for printing and playing Sudokus (on the
  Standard board) up to a size of 9x9 cells.
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