Sudoku tips for beginners: 3 techniques that work
You never have to guess in a well-made Sudoku. Every puzzle has one solution reachable by logic alone. If you’re just starting, these three beginner techniques will carry you through nearly every easy and medium board. Here are the Sudoku tips that actually move the needle.
The one rule to remember
Each row, each column, and each 3×3 box must contain the digits 1–9 with no repeats. Every technique below is just a different way of asking: where is the only place this digit can go?
1. Scan for the digit that’s almost done
Pick a digit that already appears several times, say 7. For each 3×3 box missing a 7, cross out every row and column that already has one. Often only a single cell in the box is left — that’s where the 7 goes. This is the fastest early-game move; do it for the most-placed digits first.
2. Find naked singles
Look at a single empty cell and ask what it can’t be: eliminate every digit already in its row, column, and box. If only one digit survives, it’s forced. A cell with one remaining candidate is a naked single — fill it in immediately, because it often unlocks the next one.
3. Use pencil marks (notes)
When scanning stalls, write small candidate notes in each empty cell listing the digits it could still hold. Now the puzzle does the work for you: a cell that drops to one note is a naked single, and a note that appears only once in a row/box tells you exactly where that digit lives. Our Sudoku has a notes mode built for exactly this.
Beginner mistakes to avoid
- Don’t guess. If you’re tempted to guess, you’ve missed a deduction; scan again.
- Update your notes every time you place a digit, or they’ll mislead you.
- Work the fullest rows, columns, and boxes first — they have the fewest options.
FAQ
Do you ever have to guess in Sudoku? No. A proper Sudoku has exactly one solution reachable by logic. If you’re guessing, there’s a move you haven’t spotted yet.
What are pencil marks? Small notes in a cell listing the digits still possible there. They turn hard scanning into simple elimination.
Where should I start a Sudoku? With the digit that’s already placed the most, and the rows, columns, and boxes that are nearly full.
Want a clean place to practice? Sudoku is a focused, ad-free app for iPhone with a proper notes mode and millions of puzzles. Explore more puzzle games.
