10 tips to improve your sudoku solving time

By Miguel Arechaga

Solving a sudoku is one thing; solving it fast is quite another. The good news is that speed doesn't depend on having a brilliant mind, but on working in an orderly way and avoiding the small habits that make you lose seconds without realizing it. Here are ten concrete tips used by competitive players and by anyone who wants to bring down their time on everyday sudokus.

1. Start with the most abundant numbers

Before touching anything, take a global look and spot which numbers already appear many times on the board. If the 4 is placed in seven blocks, finishing it off is almost immediate and gives you momentum. Starting with the easy wins frees up cells that in turn unlock others: it's a domino effect in your favor.

2. Scan, don't guess

Scanning (picking a number and checking which blocks only have one possible cell for it) solves most of an easy or medium sudoku in a matter of seconds. It's much faster than going cell by cell asking yourself what could go in each one. Save that detailed analysis for when scanning runs dry.

3. Work by regions, not by jumping around the board

Constantly moving your eyes from one corner to another is tiring and makes clues slip past you. Focus on one band of three blocks (horizontal or vertical) and exhaust it before moving to the next. Your brain keeps the context and spots opportunities much faster.

4. Note candidates only when you need to

Filling every cell with small pencil marks from the start wastes time and clutters the board. On easy levels, don't note anything. Save candidates for the tricky cells in hard sudokus, where you genuinely need them to spot pairs and triples.

5. Master the "last free cell"

Whenever a row, column, or block already has eight numbers, the ninth one places itself. Get used to spotting these almost-complete lines at a glance: they're the fastest cells on the board and often trigger a whole chain of solves.

6. Trust the method, don't erase

Every time you erase a number, it's a sign you guessed. Guessing forces you to redo work and wrecks your time. If you're not sure about a cell, leave it blank and move to another one: logic always ends up solving it without any risk.

7. Use a comfortable posture and screen

It sounds minor, but seeing the whole board without straining your eyes saves you seconds on every pass. On mobile, use landscape mode or enlarge the board; on desktop, sit back just enough to take in all nine rows in a single glance.

8. Time yourself and compete with yourself

What gets measured, improves. Record your time on each level and try to beat it. Don't try to beat anyone else: your only rival is yesterday's score. That gentle pressure forces you to decide faster and stop second-guessing.

9. Practice a little every day

Sudoku speed is pattern recognition, and that only trains with repetition. One daily sudoku at the same time is worth more than ten in a row on a Sunday. Our daily sudoku is perfect for building that habit without pressure.

10. Level up gradually

Staying on easy forever won't improve your time; it only reinforces what you already know. Once a level feels comfortable, move to the next one. You'll be slower at first, but the new techniques you learn will end up making you faster at the lower levels too.

Remember: method first, speed second

Speed comes on its own once the method is internalized. If the fundamentals still trip you up, check out our guide on how to solve a sudoku step by step and, when you're ready to take the leap, our advanced techniques. With a solid base and daily practice, you'll see your clock drop week after week.