Sudoku Puzzle Square Possibilities [Page 7 of 13]

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Sudoku dragon gives you a unique way of indicating what is possible and what is not possible in each square or for each square in the grid.

In this example screen shot the top left region of one 9x9 puzzle is shown. Of the nine squares only four have been allocated. Sudoku Dragon's full possibility analysis has been selected and so the smaller numbers in the unallocated squares indicate the allocations that are permitted by the rules of Sudoku.

All the different strategies for proving what is and what is not possible are color coded. The light blue background indicates that this is the only possible allocation for one of the groups of nine containing the square. A possibility with a light green background indicates the possibility is the only choice for the square (when other possibilities have been excluded).

Sudoku Dragon also uses the exclusion rules that are used to solve squares, one square in the group has a dark grey background indicating that 4 can not occur here because of the shared sub-group rule.

Give SudokuDragon a free 22 day trial by visiting our download page.
It will give you a hint on solving all those difficult squares.