How to Solve Sudoku Faster: 7 Speed Tips from Experts

Start with the most constrained cells

Beginners often fill cells in order (top-left to bottom-right). Instead, scan the entire grid for cells where the answer is most obvious — usually those with many surrounding digits.

The first few placements set up the rest. Get them right, and the puzzle opens quickly.

Scan digit-by-digit, not cell-by-cell

Pick a digit (say 5), then scan the entire grid to find every possible placement for it. Then move to the next digit. This is much faster than looking at each cell individually.

Digit-by-digit scanning is what competitive solvers use. It's the foundation of all other speed techniques.

Use pencil marks efficiently

For medium and hard puzzles, pencil marks (small candidate numbers in each cell) are essential. But there's a right and wrong way to use them.

• Do: Only mark candidates you actually need. Many beginners mark every candidate in every cell, which wastes time.
• Don't: Mark candidates for digits that are already placed in many cells.

On our online sudoku, you can skip the pencil marks entirely — the built-in checker helps you avoid mistakes.

Train your scanning speed

Speed in sudoku is largely a scanning skill. The faster you can spot patterns, the faster you solve.

Practice: Set a timer for 60 seconds. See how many digits you can locate (not place — just locate) in that time. Do this daily. Your scanning speed will improve noticeably within a week.

Don't get stuck on one cell

If a cell doesn't reveal itself in 10 seconds, move on. Come back later — when surrounding cells are filled, the answer often becomes obvious.

Getting stuck is the biggest time-waster in sudoku. The best solvers are constantly moving, scanning, and returning to unresolved cells.

Use a timer — but not every time

Timers help you track progress and push yourself. But solving under time pressure every single session can lead to sloppy habits.

A balanced routine:

• 2 sessions per week: relaxed, no timer, focus on technique
• 2 sessions per week: timed, push for speed
• 1 session per week: solve a hard puzzle, no time limit

Try our online sudoku with the pause button — it lets you take a mental break without losing track of time.

Review your slow puzzles

When you finish a puzzle slowly, don't just move on. Spend 2 minutes reviewing:

• Which cells did you spend the most time on?
• Did you miss an obvious move early on?
• Could you have spotted a technique sooner?

This review habit is what separates fast solvers from average ones. Ten minutes of review is worth an hour of aimless solving.