Numerical Fill-In Generator

Undo and Show Solution

How do I use the Undo feature?

The Numerical Fill-In Generator allows the user to go back one step in working the puzzle.  The Undo feature utilizes both the AutoFill feature and individual numbers entered into the puzzle.  ONLY THE LAST ACTION CAN BE UNDONE.

• Undo the last AutoFill procdure
  The program remembers the last number that was entered into the User Grid with the AutoFill procedure.  If you choose to take back the number you filled in, the grid will be returned to its last state leaving behind any numbers that were there.   Additionally the checkbox for that number will become unchecked. In this example, the number 0181595839 would be removed and its checkbox would be unchecked if the Undo feature was clicked.
  

• Undo a single number
  The program will remember the last number entered into the puzzle grid using the number keys.  If you wish to take back this action, the program will state the number entered and the grid location in which it was entered in row and column values.  The row number starts with 1 and increases going down.  The column number starts with 1 and increases going right.  The maximum row and column number is limited to the puzzle size (10 for small puzzles, 15 for normal puzzles, and 20 for large puzzles.)   In this example, the 8 that begins 89 would be removed if the Undo feature was clicked.
  

How do I know if my solution is correct?

The Numerical Fill-In Generator allows you to see the solution to the puzzle as it was created whenever you wish.  Under the Edit menu is the option Show Solution / User Grid.  Selecting this menu item will switch between the solution of the puzzle and user's current work on the puzzle.  The grid's title will tell you which mode you are in currently.  Additionally, the Solution Grid is disabled (grayed out) so you cannot edit the solution to the puzzle.  To determine if you have correctly solved the puzzle, check the grids.  Every puzzle has a solution.  If your solution differs from the one the program created, but you used all of the numbers correctly, then you have found an alternate solution to the puzzle.  The program does not prevent the user from making mistakes, but it does help the user to solve the puzzle in his / her own way.