An old fogy's website
Enjoy this interactive Sudoku Analyzer. You may also request Jerry's personal analysis of any particular Sudoku puzzle, and/or accept the Sudoku Challenge.
another bug fix. Read report
General Information

You know the simple Sudoku rules: Each row, column, and 3x3 square must contain the digits 1 through 9, in any order. This web page can be used to solve a Sudoku puzzle, to create a puzzle, and perhaps to learn a little about Sudoku, and improve one's Sudoku solving skills.

To solve a computer-generated Sudoku puzzle: Click "New Puzzle", then enter numbers into the blank cells to solve. Note that you can ask for help along the way, and that you can change the virtual pencilled (erasable) entries to ink (indelible, sort of) as you progress.

To create your own Sudoku puzzle: Just start entering numbers, and periodically click "Analyze" to see if you have a solvable puzzle (exactly one possible solution). Click "All->Granite" at that point, and then begin to solve your new puzzle.

Notice the '?' help buttons to explain each Control Panel function.

 Sudoku Analyzer 3.0.110 
 Copyright (c) 2010-2022 Gerald DePyper 
  Stats    Terms 

Load New Puzzle
Select the desired level of difficulty, then clickNOTE: This will irretrievably replace all current grid values
 Surprise me
Use puzzle from printed book
 English edition      Spanish edition
NOTE: This will irretrievably replace all current grid values
 Load puzzle
 Solution step 
Select an unsolved cell at which to peek, then click 'OK'
Control Panel
Start with the "Read first" button.
Copyright (c) 2010-2022 Gerald DePyper (GPL)
rev. 2022.06.13