How to Play Sudoku: A Beginner’s Guide

Sudoku is a logic puzzle played on a 9x9 grid. The grid is divided into nine smaller 3x3 boxes, and some cells already contain digits when you start - these are the clues, or "givens".

Your job is to fill every empty cell with a digit from 1 to 9. There is no math and no guessing required: a well-made Sudoku has exactly one solution that you can always reach with pure logic. If you can count to nine, you can play.

Everything in Sudoku comes from a single rule: no digit may repeat within a row, a column, or a 3x3 box. That is the entire game.

Put another way, each of the three regions below must contain the digits 1 through 9 exactly once - no duplicates, no gaps.

• Each of the 9 rows contains 1-9 with no repeats
• Each of the 9 columns contains 1-9 with no repeats
• Each of the nine 3x3 boxes contains 1-9 with no repeats

A Sudoku grid has 81 cells: 9 rows across, 9 columns down, and nine 3x3 boxes marked by the heavier border lines. When you sit down to a puzzle, the filled-in digits are your clues - the rest is yours to work out.

Before placing anything, get in the habit of checking all three regions a cell belongs to: its row, its column, and its box. A digit is only allowed in a cell if it does not already appear in any of those three.

The simplest move in Sudoku is finding a cell where only one digit can possibly fit. Look at the highlighted cell below and check its three regions.

Its row already uses 1, 2, 3, 4, 6, 7, 8 and 9. Its column and box rule out those same digits too. Every digit except 5 is blocked - so 5 must go here. That single-candidate logic, repeated, solves the whole board.

When you place a digit, fresh single-candidate cells often appear nearby. Keep scanning after every move and the puzzle unravels one forced cell at a time.

That is genuinely all you need to start. The fastest way to improve is to play: begin with very easy or easy boards where every cell can be found by simple scanning, then move up as the patterns become second nature.

When easy puzzles start to feel quick, our techniques guide covers the named patterns - hidden singles, pointing pairs, X-Wings - that hard and expert grids are built around. But there is no rush: thousands of satisfying puzzles are solvable with just the rule you learned today.

What is the goal of Sudoku?

Fill every empty cell in the 9x9 grid with a digit from 1 to 9 so that no digit repeats in any row, any column, or any of the nine 3x3 boxes. A proper Sudoku has exactly one valid solution.

Is Sudoku a math puzzle?

No. Sudoku uses digits, but there is no arithmetic involved - the numbers are just symbols. You could play with nine letters or colors instead. It is a pure logic and pattern-spotting puzzle.

Do you ever have to guess in Sudoku?

No. A well-formed Sudoku is always solvable by logic alone, with a single unique solution. If you find yourself guessing, there is almost always a cell somewhere on the board with a forced answer you have not spotted yet.

How long does a Sudoku take to solve?

An easy puzzle takes most people five to fifteen minutes. Hard and expert puzzles can take much longer because they require advanced techniques. As you practice, your solving time drops quickly.

What is the best way for a beginner to start?

Start with very easy or easy puzzles, where every cell can be solved by scanning rows, columns, and boxes for the only digit that fits. Build the habit of checking all three regions before placing a digit, and move up in difficulty only when the level feels comfortable.