Sudoku Solver with Step-by-Step Reasoning

Stuck on a difficult Sudoku puzzle? Our online solver doesn't just give you the answer — it shows you exactly how to get there. Each step is annotated with the solving technique used, from basic Last Free Cell to advanced Pointing Pairs.

Simply enter your puzzle into the grid, click Solve, and watch as each number is placed with a clear explanation. This is the difference between getting an answer and learning how to solve. Our solver identifies and labels 9 distinct logical techniques, making it perfect for both beginners who want to learn and experienced solvers who want to verify their logic.

Want to improve your skills? Explore our complete techniques library with dedicated guides for each solving strategy. Start with Last Free Cell and work your way up to Pointing Pairs.