How to play Sudoku

All the Sudoku's on our website can be solved with logic using these methods.

Introduction

 
  Sudoku Rules and Terminology

Basic Solving Techniques

 
  Last Digit / Full House
 
  Hidden Singles
 
  Naked Singles

Solving Aids

 
  Using Pencil Marks
 
  Using Highlights

Intermediate Solving Techniques

 
  Locked Candidates Type 1
 
  Locked Candidates Type 2 (Claiming)
 
  Naked Pairs/ Twins
 
  Naked Triples
 
  Hidden Pairs

Advanced Solving Techniques

 
  X Wing
 
  Swordfish
 
  XY Wing (aka Y Wing)

>> use checkboxes to track your progress.