About Advanced Sudoku
Advanced Sudoku is for players who have mastered the basics and want to push further. These hard 9x9 puzzles have few givens and demand disciplined logic.
Expect to lean on pencil marks and elimination techniques. As always, each board has exactly one solution and can be solved by logic alone.
How to play Advanced Sudoku
- Fill every empty cell with a digit so that each row contains the digits 1-9 with no repeats.
- Every column must also contain the digits 1-9 exactly once.
- Each of the nine 3x3 boxes must contain the digits 1-9 exactly once.
- Use the number pad or your keyboard to place a digit, and the Erase button to clear a mistake.
- The puzzle is solved when the whole grid is filled correctly.
Tips for Advanced Sudoku
- Keep full candidate lists for empty cells - Advanced puzzles are won on eliminations.
- Look for locked candidates (pointing pairs) to remove options from a box, row or column.
- Watch for naked and hidden pairs to unlock stubborn regions.
- Stay organised; a single wrong pencil mark can send you down the wrong path.
Strategies and techniques for Advanced Sudoku
Pencil marks
Write small candidate numbers in each empty cell. As you place digits, cross candidates off. Organised pencil marks are the foundation of every advanced technique.
Locked candidates (pointing pairs)
When a digit's only spots inside a box all sit in one row or column, that digit can be removed from the rest of that row or column outside the box - and vice versa.
Naked pairs and triples
If two cells in a unit share the exact same two candidates, those two digits belong to those cells and can be erased from every other cell in the unit. The same idea extends to triples.
Why play Advanced Sudoku?
- Sharpens logical thinking - every move is a small deduction that trains your brain to reason step by step.
- Boosts concentration and patience, since a single puzzle rewards sustained, focused attention.
- Improves working memory as you hold candidate numbers and patterns in your head.
- A calm, screen-friendly way to relax while still giving your mind a real workout.