Pravidlá sudoku
Sudoku rules: how the grid works
Learn the core Sudoku rules so every move feels deliberate instead of random.
A standard Sudoku puzzle is a 9x9 grid split into nine 3x3 boxes. Each row, column, and box must contain the digits 1 through 9 exactly once.
What every legal board must satisfy
- Each row must contain the digits 1 to 9 with no duplicates.
- Each column must contain the digits 1 to 9 with no duplicates.
- Each 3x3 box must contain the digits 1 to 9 with no duplicates.
- You solve the puzzle with logic, not by guessing until something fits.
How rows, columns, and boxes connect
Every empty square belongs to one row, one column, and one 3x3 box at the same time. A digit can only go into that square if it does not already appear in any of those three regions.
That overlap is what makes Sudoku interesting. A number ruled out by the row can still help you confirm the answer through the box, and vice versa.
What counts as a legal move
If you place a 7 in a square, there cannot already be a 7 in the same row, the same column, or the same 3x3 box.
Strong players scan the three related regions before making a move. That habit reduces mistakes and creates faster solves on harder boards.
Rýchle otázky
Do I need math to solve Sudoku?
No. Sudoku uses numbers as symbols. Success comes from pattern recognition, elimination, and careful attention.
Is every Sudoku puzzle solvable with logic?
A well-made Sudoku puzzle has one valid solution and can be solved logically, although some puzzles require longer chains of reasoning than others.