Sudoku Guides & Tips

Everything you need to get better at Sudoku — from your very first solve to the techniques that crack hard puzzles. Free, no signup.

How to play

Step-by-step guides to learning Sudoku and the techniques that solve it.

The scanning method expert solvers use to find placements in seconds, without pencil marks.

The difference between a naked single and a hidden single — and how to spot both quickly.

The only rule you need, a walk-through of your first solve, and the two techniques that finish most easy puzzles.

The habits that trip up solvers — and how to fix them so you stop getting stuck.

A grid that can't be finished almost always means an earlier error. Here's how to find and fix it.

The seven habits that stall beginners — and the simple fixes that get you solving again.

Straight answers to the questions Sudoku players ask most.

Typical solve times by difficulty — and the habits that make you faster.

Short answer: no — and here's why a well-made puzzle never needs a guess.

Put the techniques to work on a free puzzle — easy, medium, hard, or today’s Daily Challenge.