Hey kids, this is a sudoku puzzle version only for you and a funny way to practice your math and logical skills. Maybe it's difficult to solve the first puzzle but don't give up, it's just a matter of practice.
Every 2x2 block must include all numbers from 1 to 4. That means every block filled with the same color should only contain each of these numbers once.
The same rules are valid for every row or column. Now push the start button and have fun with this sudoku puzzle only 4 kids!