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SuDoku (current version V4.10, September 2025)
The puzzle is displayed in an Excel spreadsheet, which works in most versions which support the Control Toolbox* The puzzle can be cleared
and a new one input manually and saved mid way for completion later. Inputting a table and all operations are explained in the Rules tab 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, via cell M2 3) Optional prompting can
highlight possible squares where a number can [or must] be safely input. 4) Tip: You can input several numbers in a square and use Sure/Unsure
to size them and ignore the Error message, it may help for pairs
Optional prompting updates a separate table with "pencil marks" [possible
numbers that can be input in the corresponding square].- extended in version 4.10 Immediately obvious false inputs are signalled with an "Error" indication. Latest Download xls file (211k) which contains a partially completed table [After download, right click properties and unblock the file before opening See the full rules and information in the Rules tab of the Excel workbook * Some older Office systems received an update that broke the control buttons (current version V3.70, May 2024) |