A fully-featured Sudoku web application built with React and TypeScript, bootstrapped with Next.js. This project focuses on clean architecture, game logic, and user experience rather than using external Sudoku libraries.
🔗 Live Demo: https://sudoku-puzzles.vercel.app
- 🧠 Sudoku puzzle generator with difficulty levels (Easy / Medium / Hard)
- 🔍 Backtracking solver
- ✏️ Candidate calculation for each empty cell
- ↩️ Undo & erase functionality using move history
- ⌨️ Keyboard navigation (arrow keys + number input)
- 🎯 Row, column, box, and value highlighting
- ❌ Mistake tracking
- ⏱ Timer with persistent state
- 💾 Game persistence using LocalStorage
- 📱 Responsive layout for desktop and mobile
- 🔒 Read-only prefilled cells
- React
- TypeScript
- Next.js
- HTML & CSS
- Vercel
- Game logic (generator, solver, candidates) implemented as pure utility modules
- UI components separated from state management
- Efficient candidate computation using memoization
- Undo implemented via move history instead of full grid snapshots
- LocalStorage used to persist game state across refreshes
- Unified mouse and keyboard input handling
npm install
npm run dev
- Notes / pencil mode toggle
- Difficulty rating based on solving techniques
- Accessibility improvements
- User accounts (sign up / log in)
- Daily Sudoku challenges with shared puzzles for all users
- Hints system and error explanations
- Cloud save / cross-device progress syncing
This project is licensed under the MIT License.