Sudoku Generator, Solver and Guide

These tools help you make, solve and learn sudoku. Enter the digits you have to solve the grid or take one logical step, generate a batch or type your own clues, print empty grids, or follow the guide to the rules and techniques.

How to choose: if you are stuck on a puzzle you already have, use the solver and take a single logical step rather than the whole answer. If you are new to the game or want to improve, read the guide first; it explains the rules on a small board before the solving techniques. If you want puzzles of your own, use the generator, or type clues from a book or newspaper to check that they have exactly one solution. For drawing by hand or teaching a class, print the blank grid template in the size you need.

Tools in this group

• Blank Sudoku Grid Template — Print empty sudoku grids in any size, with optional candidate dots and a name line.
• How to Play Sudoku and Solve It Step by Step — Learn the three rules, then watch each solving technique work on a real puzzle, one step at a time.
• Sudoku Generator and Sudoku Maker — Generate a batch of puzzles with your settings, or type your own clues and check that the puzzle has one solution.
• Sudoku Solver — Enter the digits you have, then solve the whole grid or go one logical step at a time.