Su Doku (current version V3.55, April 2009)


                                        Pencil Marks


The puzzle is displayed in an Excel spreadsheet. The puzzle can be cleared and a new one input manually and saved mid way for completion later.

There are optional different levels of highlighting possible, with a user choice of colour scheme.

1) Original or sure entered numbers can be highlighted to simplify back tracking in case of an error.

2) Any single number at a time can be highlighted to simplify solving the puzzle.

3)  Optional prompting can highlight possible squares where a number can [or must] be safely input.

Optional prompting updates a separate table with "pencil marks" [possible numbers that can be input in the corresponding square].

Immediately obvious false inputs are signalled with an "Error" indication.

Download xls file  (86k)