Sudoku

A polished, static Sudoku web game built with plain HTML, CSS, and JavaScript.

Play it here: https://frankstop.github.io/Sudoku/

Overview

Sudoku is a browser-based puzzle game with a clean board, large touch targets, keyboard support, and a calm visual style designed for desktop and phone screens.

The app runs without a backend, build step, paid service, or framework. It can be hosted directly from GitHub Pages.

Features

• Playable Sudoku puzzles with Easy, Medium, Hard, and Expert difficulty levels
• Title screen with difficulty selection, new game, resume, load save, and settings
• Locked givens with a distinct visual style
• Editable cells for player entries
• Mouse, touch, and keyboard input
• On-screen number pad
• Notes mode for pencil marks
• Hint, erase, reset, undo, and redo controls
• Timer and progress display
• Local save data for resuming an active puzzle
• Mistake checking with inline highlights
• Selected cell, matching number, row, column, and box highlights
• Completed-number handling in the number pad
• Polished completion dialog with time and difficulty
• Responsive layout for desktop, tablet, and phone screens

Local Setup

Open index.html directly in a browser, or serve the folder with any static server:

python3 -m http.server 8000

Then visit:

http://localhost:8000

Project Structure

.
├── index.html
├── styles.css
├── script.js
├── README.md
└── RELEASE_NOTES.md

Deployment

This project is ready for GitHub Pages. The live site is served from the main branch root:

https://frankstop.github.io/Sudoku/

Tech Notes

• No backend
• No bundler
• No package install required
• Plain HTML, CSS, and JavaScript
• Active puzzle saves use browser localStorage
• Google Analytics tag included in index.html