sudokly

Sudoku Tips & Tricks

You don't need advanced techniques to improve fast, you need better habits. These are the tips that make the biggest difference, from your first easy grid to your first evil one. Each links to a deeper guide when you're ready.

The habits that matter most

Scan before you write. Pick a digit and check every row, column and box for the one cell where it must go. Working digit by digit finds more than staring at one empty cell.

Never guess. Every proper sudoku has exactly one logical solution. If you're tempted to guess, you've missed something, back up and scan again. Guessing turns a solvable puzzle into a mess of erasing.

Start with the fullest areas. Rows, columns and boxes that already have the most digits are where the next placement is easiest to find.

Use pencil marks once scanning stalls. Write every candidate in each empty cell; patterns like pairs and triples only become visible once the candidates are on the grid.

Work in pencil-mark mode on hard puzzles. On hard and up, fill full candidates early rather than waiting to get stuck, the intermediate techniques need them.

Double-check before you commit a hard-won digit. One wrong placement early can waste the whole solve. If a cell ever has no candidates, you made a mistake earlier.

Which technique to learn next

Practice deliberately

Match the puzzle to the skill you're building. If you're learning pointing pairs, play hard puzzles where they appear, not easy ones you can scan through. Rate any puzzle with our difficulty tool to know what you're getting.

Slow down to speed up. Speed comes from pattern recognition, and pattern recognition comes from solving carefully, not racing. The clock takes care of itself once the patterns are automatic.

Frequently asked questions

How do I get better at sudoku?
Build habits before techniques: scan digit by digit, never guess, start in the fullest rows/columns/boxes, and use full pencil marks once simple scanning stalls. Then learn one technique at a time, starting with hidden singles and naked pairs, and practice on puzzles where that technique actually appears.
What is the best way to start a sudoku puzzle?
Scan for hidden singles first: take each digit 1-9 and find the single cell it must occupy in a given box, row or column. Begin in the areas of the grid that already have the most digits filled in, since placements are easiest to find there.
Should you ever guess in sudoku?
No. A well-formed sudoku has exactly one solution reachable by logic alone. Guessing means you've missed a deduction. If you're stuck, add full pencil marks and look for pairs, pointing pairs, or an X-wing instead.
How do I get unstuck on a hard sudoku?
Fill in every candidate, then look for pointing pairs first, they're the most common unblocking move. If those don't help, scan a recurring digit for an X-wing, or try coloring and XY-wings on expert puzzles.