Sudoku for Beginners

Sudoku isn't a math puzzle

This surprises a lot of beginners: Sudoku numbers could just as easily be letters or shapes — you're not adding or multiplying anything. The only skill involved is noticing where a number can and can't go, one row, column and box at a time.

The one rule that matters most

Every row, every column, and every 3×3 box must contain the numbers 1 through 9, with no repeats. That's the entire rulebook. Everything else — every "technique" — is just a faster way of applying that one rule.

Where to start

• Begin with Beginner difficulty — it has the most starting numbers, so there's always an obvious next move.
• Use the Hint button freely. It's there to help, not to be avoided — even experienced players use hints when they're stuck.
• Try Notes (pencil marks) once you're comfortable with the basics — jotting down which numbers could still fit in a cell makes harder puzzles much easier to manage.
• Don't worry about the timer. It's there if you enjoy it, but there's no rule saying you have to solve quickly, especially not on your first puzzles.

Common beginner mistakes

The most common early mistake is only checking a cell's row before placing a number, and forgetting to also check its column and its 3×3 box. Sudoku SB highlights all three automatically whenever you select a cell, so you can see at a glance whether a number is safe to place.

The second common mistake is guessing. If you're not sure a number is correct, it usually isn't — Sudoku always has a logical reason for every number, so if you can't explain why a number belongs somewhere, it's worth looking a little longer before placing it.

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