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Sudoku is a logic puzzle where you fill empty cells with digits from 1 to 9. The classic board consists of 81 cells divided into nine rows, nine columns, and nine 3×3 boxes.
The goal of the game is to fill the entire board so that no digit repeats in the same row, column, or 3×3 box.
When solving Sudoku, you must follow three basic rules:
All three rules apply simultaneously. This means that before entering a digit into an empty cell, you must check its row, column, and box.
The simplest way is to search for cells where the missing digit can be uniquely determined.
Check which digits already exist in the same row, column, and 3×3 box. Digits that already appear in these areas cannot be re-entered into the analyzed cell.
This way, you gradually narrow down the number of possible answers.
After each correct move, it is worth looking at the board again. Placing a single digit may create a new unique solution elsewhere.
You can analyze individual cells, entire rows, columns, or 3×3 boxes. For more challenging boards, tracking possible positions of a specific digit is also helpful.
The next move is not always immediately obvious. If basic analysis does not reveal a solution, look at the board from a different perspective and search for relationships between multiple cells.
This is what Sudoku strategies are for. They allow you to analyze more complex patterns and eliminate possibilities that cannot be ruled out using only basic rules.
Time for strategies! Discover various ways to solve Sudoku and learn how to handle harder boards.
See Sudoku StrategiesOnce you know the basic rules or learn a new strategy, you can use it during your own game.
Play Sudoku