Introduction

Sudoku is a logic puzzle that has captivated millions worldwide. No math required—just pure deductive reasoning.

What is Sudoku?

Sudoku is played on a 9×9 grid divided into nine 3×3 boxes. Some cells contain numbers (clues), and your goal is to fill the remaining cells following three simple rules:

1. Every row must contain digits 1-9 exactly once
2. Every column must contain digits 1-9 exactly once
3. Every 3×3 box must contain digits 1-9 exactly once

That's it. Simple rules, infinite depth.

A Brief History

The modern Sudoku puzzle emerged in 1979, created by American architect Howard Garns under the name "Number Place." It gained massive popularity in Japan during the 1980s, where it received its current name—"Sudoku" (数独), meaning "single number."

The puzzle exploded globally in 2004-2005 when newspapers worldwide began publishing daily Sudoku. Today, it remains one of the most popular logic puzzles ever created.

Why Play Sudoku?

Mental exercise — Sudoku strengthens logical thinking, pattern recognition, and concentration. Studies suggest regular puzzle-solving may help maintain cognitive function.

Accessible challenge — Unlike many games, Sudoku requires no prior knowledge, special equipment, or opponent. Just you and the puzzle.

Satisfying progression — As you improve, you'll tackle harder puzzles and discover elegant solving techniques. There's always a new challenge.

Meditative focus — Many players find Sudoku relaxing. It demands enough attention to quiet mental chatter while remaining low-stress.

Difficulty Progression

Puzzles range from gentle introductions to fiendish challenges:

Start where you're comfortable and progress naturally.

Ready?

Head to the Quickstart to begin playing, or continue to How to Play for the complete rules.