In Doof Sudoku, your gray brain cells are in high demand! Do not let yourself be deterred by the title of this entertaining game. It remains only a game. Doof Sudoku builds on the game play of the classic Sudoku. You must write down the numbers 1 through 9 at the most on a playing surface of varying size. Therein, each number is allowed to appear in the horizontal and vertical number line only once. The dual listing of a number within a series of numbers would make the logic of this game naught from the ground up. We are, after all, not counting 3 or 8 twice! Doof Sudoku slowly teaches you how to approach the complex problems of this game. For example, you have to solve only a 4 x 4 squares large number puzzle in stage 1 of the game. In stage two, the number of existing fields increases to a total of 81 pieces (9 x 9). You are lucky if you are given a relatively large amount of numbers right from the beginning, because this makes it easier for you to pick the correct allocation of numbers in each row of numbers. In this Sudoku online game, you can dispense entirely with the use of your keyboard. Hidden under each field, you can find the right set of numbers. If you are convinced that you were able to calculate the correct number for a given field, you can select the appropriate number from the series of numbers by clicking on it and then pressing “Enter”. However, if the number already occurs in the series and you have guessed wrong, it will show you where in the game the number already appears with a red circle. On the right side, you will see a timer. For each round, you only have the respective amount of predetermined time available. Right above the timer, you can see your score achieved thus far. The faster the round is completed, the more points are credited to your points account. With a simple graphics and a huge long-term motivation, you can train your brain cells to the maximum in this game.