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About game
Classic Sudoku (9x9) is an intellectual puzzle that tests your logical thinking and attention. You have to fill the empty cells of the field with numbers from 1 to 9, strictly adhering to three simple rules.
How to play
Your task is to fill all the empty cells of the 9×9 field with numbers from 1 to 9, following three basic rules:
There should be no repeating numbers in a row (all numbers from 1 to 9).
In a column, each number appears only once.
In each small 3×3 square (highlighted in bold), the numbers should also not be duplicated.
Management
To enter a digit, click on an empty cell (it will be highlighted), then click on the desired digit on the control panel.
The editing modes are switched by the "Eraser" button:
The green indicator (note mode) allows you to enter multiple digits in a cell.
The red indicator (clear mode) completely removes all digits and notes from any cell when clicked.
The white indicator (normal mode) is the standard mode for entering final digits (like a pen).
Hint: Click on the "Hint" button when a cell is highlighted, and one correct digit will be automatically inserted into the cell.