A sudoku game, built with Node.js, Express, JavaScript, and designed with HTML, CSS, Bootstrap. Users may change the page language and level of difficulty: easy, medium, hard. Timer and instant-solve functions included. Sudoku puzzles are stored in MongoDB and are pre-solved using a backtracking with forward checking algorithm written in JavaScript.

Sudoku Demo: https://www.youtube.com/watch?v=ss6M6po_j3w