Sudoku Helper

This page helps you solve sudoku puzzles by showing choices satisfying two simple rules: at-most-one and at-least-one of every digit must appear in every row, column and square.

Choices that violate the at-most-one rule are omitted. Alternatives to digits that must be chosen by the at-least-one rule are grayed. HEIGHT 520

There are many programs that solve sudoku, in many programming languages. One of them which is worth studying is Roger Hui's in J

In addition to that, there are many programs that help solving sudoku. One good example is Ward Cunningham's sudokant written in perl as cgi wiki

This html script had descended from the perl cgi through deno and then eventually here. deno github