How to play
To win, you need to fill the free cells with numbers from 1 to 9 so that in each row, in each column and in each small 3x3 square, each number occurs only once.
By clicking on the "pencil" button, you can insert marks in the cells, or you can erase them by re-entering the same number or use the eraser to clear all the marks in the cell at once.
Points are awarded according to the following formula:
For easy difficulty level: +1000!
For normal level difficulty: +2000!
For hard level of difficulty: +3000!
Additionally, points are awarded for time according to the formula: 1200 - time in the game in seconds.
If you solve Sudoku in less than 20 minutes, you will get extra points!
For each mistake: - 200!
For each hint: - 50!
Have a good game!