Sudoku Helper

Hints, explanations and step-by-step solving for web Sudoku puzzles.

Stuck on a tricky Sudoku puzzle? Sudoku Helper is your intelligent companion designed to help you learn, improve, and solve puzzles without just spoiling the answer. Whether you are playing the New York Times Daily Sudoku, Sudoku.com, or WebSudoku, Sudoku Helper seamlessly detects your board and offers multi-tiered logical guidance. Key Features: Smart Step-by-Step Hints: Get non-spoiler nudges or step-by-step breakdowns of the next logical move. The helper teaches you why a move works, rather than just filling it in. Full Technique Engine: From basic Naked Singles and Hidden Singles to advanced techniques like X-Wings, XY-Wings, Unique Rectangles, and Alternating Inference Chains (AIC). Automatic 20-Second Refresh & Countdown: Your board state updates automatically, complete with a live countdown timer and a manual refresh button if you want instant updates. Candidate & Pencil Mark Support: Start fresh or use your own pencil marks. The helper can even help you instantly clear outdated candidate notes when an elimination step is found. "Why not?" Checker: Click any empty square and pick a digit to see why that number cannot go there. Fully Integrated Dark Mode: Automatically matches the dark or light theme of your browser and puzzle page. Privacy Focused: 100% local operation with zero personal data collection. Whether you're a beginner learning basic strategies or an advanced player tackling expert grids, Sudoku Helper elevates your game.