Sudoku classic (9): is an intellectual puzzle that will challenge your logical thinking and attention.
Your main objective is to fill the empty cells of the 9x9 game board with numbers from 1 to 9, following three simple yet strict rules.
The board initially contains some hint numbers. Using logic and the method of elimination, you must find the only correct solution for the entire grid.
Perfect for mental training, the game develops critical thinking, concentration, and patience. Challenge yourself by choosing difficulty levels from beginner to expert, and enjoy the elegance of this world-renowned number puzzle!
How to play
Your goal is to fill all the empty cells in the 9x9 grid with numbers from 1 to 9.
Row: Each row must contain all the numbers from 1 to 9 without repetition.
Column: Each column must contain all the numbers from 1 to 9 only once.
3x3 square: Each small square outlined in bold must be filled with numbers from 1 to 9 without repetition.
Controls and gameplay
To insert a digit: Click on an empty cell to select it, then click on a digit on the control panel.
Editing modes (switch by the "Sterka" button):
Green indicator (Notes mode): Allows you to insert multiple hint digits into cells. These are your notes.
Red indicator (Clear mode): Click on any cell to completely clear all digits and notes in it.
White indicator (Normal mode): Standard mode for inserting final digits (pen).
Using a hint: Press the "Hint" button when a cell is selected. One correct digit will be inserted.