This repl generate some sudoku puzzles that have a particular challenge. Not every puzzle is completely solvable, but it is possible to use a particular strategy to solve one more cell.
The index.html file is a generated file from the genChallenges.html template. Choose the challenge type and then click refresh challenge. Every challenge type should eventually return a puzzle but you may need to click a few times. Each puzzle should include one or more hints as well as a solution if you get stuck.
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 challenge finder runs in a worker.
The hintMaker.js file adds hints and solutions for a given challenge.