Sudoku Guides & Rules

Beginner

How to Play Sudoku

Complete beginner's guide to Classic Sudoku rules, strategies, and tips.

Variant

Killer Sudoku Rules

Learn cage sums, the rule of 45, and strategies for Killer Sudoku.

Variant

Sandwich Sudoku Rules

Understand sandwich clues and how to find numbers between 1 and 9.

Variant

Diagonal Sudoku Rules

Classic Sudoku plus diagonal constraints — learn the extra rules.

Advanced

Mega Sudoku 16x16

The ultimate Sudoku challenge. Rules and tips for the 16x16 grid.

Variant

Little Killer Sudoku

Diagonal arrow sums explained — rules and solving strategies.

Essential

Sudoku Solving Techniques

30+ techniques from beginner to expert: naked singles, X-wings, and more.

Overview

Sudoku Variants Compared

Side-by-side comparison of all 8 Sudoku types with difficulty ratings.