Crossword Express Sudoku puzzles may contain any printable character (Symbol). The set of Symbols
used in the current puzzle are always displayed in a panel above the puzzle.
Any character which is typed at the keyboard will be placed into the red focus cell, provided that it is
a member of the Symbol Set for this puzzle.
The location of the red focus cell may be shifted by means of the cursor control keys (Up, Down, Left,
Right, Page Up, Page Down, Home, End).
Under default conditions, the program displays in each unsolved cell, the set of candidate symbols which
might legally be placed into that cell. Whenever a solution symbol is placed into one of the cells, the list of candidate
symbols in other cells is automatically updated.
If you are familiar with some of the more advanced Sudoku solving techniques (X wing, Swordfish etc),
you may see that certain of the listed candidate symbols cannot possibly be a solution for the cell in which they are shown.
Such candidates may be removed by pointing and clicking with the mouse.
If you prefer to solve Sudoku puzzles without the help of these candidate symbols in the unsolved cells,
clicking the Assist button will disable this behaviour.
The Undo button will undo any and all changes you have made in strict reverse of the order in
which they were made.
With some very difficult puzzles, you may reach a point where you can see no way of proceeding further.
At this point you can make a guess for one of the unsolved cells, and then continue with the solution until either the puzzle
is solved, or you find a cell for which no candidate symbols are listed. If this happens, use the Undo button to return
to the point where you made your guess, and then make a different guess.
If the puzzle contains a Hidden Message then there will be a series of colored cells distributed
across the puzzle. As the solution of the puzzle proceeds, the message will gradually appear in these cells.
The Select Dictionary and Select Puzzle buttons allow you to choose your puzzle from among
the entire set of puzzles currently available in your Crossword Express system.
The Grow and Shrink buttons allow you to adjust the size of the Solve Window. For example,
teachers wanting to use the Solve function as a classroom exercise will probably want to grow the window to the
maximum size permitted by their computer system.
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