This repl provides hints as you solve a sudoku puzzle.
The index.html file is a generated file from the genChallenges.html template.
Just input a puzzle string in the box and then click any square you can figure out.
Add CSS by editing the style.css file that is linked to in the head section or inline edit the style section in the head.
The makehtml.js file will generate the index.html.
The hintMaker.js file adds hints and solutions for each possible next step.