Sudoku Generator & Solver
Generate, print, or instantly solve Sudoku logic grids.
Ultimate Classic Sudoku Generator & Auto-Solver
Welcome to the most complete Classic Sudoku tool on the web. Whether you are looking to play infinite mathematically perfect grids or need an instant solution for a tough puzzle from a newspaper, you are in the right place. Our Sudoku suite works entirely in your browser without any annoying reloads, offering lightning-fast backtracking algorithms to solve or generate any board instantly.
How to Play Classic Sudoku
The rules of Classic Sudoku are simple but mastering it takes logic. Your goal is to fill the grid with numbers so that every row, every column, and every 3x3 block contains all the digits from 1 to 9 exactly once. No duplicates are allowed within any of these groups! Start by scanning for easy placements (Naked Singles) and work your way up to advanced techniques.
Features & Tools
- Play Mode: Generate millions of unique grids across Easy, Medium, Hard, and Expert difficulties.
- Grid Sizes: Not just 9x9! Try beginner 4x4 and 6x6 sizes, or move on to our exclusive Giant variants.
- Auto-Solver: Switch to solver mode, type in the numbers from any external puzzle, and get the solution instantly.
- Help Me (1 Cell): Stuck? Our smart logic engine will fill in a single cell to give you that much-needed push.
- Print Mode: Create high-quality, printer-friendly PDFs of your puzzles for offline solving.
Disclaimer: This page provides an independent solver and generator tool and is not affiliated with, sponsored by, or endorsed by any specific puzzle publishers or brands.