The goal of the game is to fill in a grid with 81 digits (size of 9x9 cells) with remaining digits 1 up to 9 so that no digit appears in a row, a column, or a box (size of 3x3 cells) more than once. The difficulty of Sudoku is in the difficulty of calculating what digit to fill and the total number of cells that are empty. You can write hints i.e. small digits that could be candidate digits in a given cell. You can use candidate digits not only for an overview but also for simple or advanced strategies.
The game is controlled with the mouse. When you click with the left mouse button a circle with 9 numbers appears. When you select a number you can do one of two actions: by pressing a number you enter a guess or by pressing a number with a short delay you fill in a final number.
The maximum number of points you can gain is given by the difficulty of the quiz (from 4000 points at the easiest level up to 10000 points at the hardest level). The difficulty is drawn with a white horizontal line. The maximum number of points gradually decreases (total time is 60 minutes) during the game time. Moreover, for every wrong digit you have filled in you lose 6 minutes of the total time. The yellow line drawn in the white line indicates your current progress and your current number of points. Beware! If you end the game at the wrong time your score will be 0 points.
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