Sudoku Guides & Rules

Beginner

How to Play Sudoku

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

Beginner

Sudoku Tips for Beginners

15 practical tips to get faster and smarter at Sudoku — no guessing needed.

Beginner

Mini Sudoku 6x6 Rules

The perfect starter grid — 6x6 rules, strategies, and tips for beginners and kids.

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

Mini Sandwich Sudoku

Sandwich clues on a 6x6 grid — rules, every possible sum, and solving tips.

Variant

Diagonal Sudoku Rules

Classic Sudoku plus diagonal constraints — learn the extra rules.

Variant

Jigsaw Sudoku Rules

Irregular regions replace the boxes — rules, the law of leftovers, and tips.

Variant

Mini Jigsaw Sudoku

Irregular regions on a 6x6 grid — rules and beginner-friendly strategies.

Variant

Kropki Sudoku Rules

White and black dots explained — consecutive and double clues, plus strategy.

Variant

Mini Kropki Sudoku

Dot clues on a 6x6 grid — white and black dot logic made easy.

Variant

Thermo Sudoku Rules

Thermometers where digits increase from bulb to tip — rules, position bounds, and strategy.

Variant

Mini Thermo Sudoku

Thermometer logic on a 6x6 grid — position bounds made easy.

Variant

Arrow Sudoku Rules

Path digits add up to the circled cell — rules, sum bounds, and strategy.

Variant

Mini Arrow Sudoku

Arrow sums on a 6x6 grid — the friendly way to learn the sum rule.

New

Fog of War Sudoku Rules

The board hides under fog — correct digits reveal it, plus surprise rules in the mist.

Variant

Mini Fog of War Sudoku

The free 6x6 fog variant — hidden board and surprise rules made easy.

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 18 Sudoku types with difficulty ratings.