Math puzzle Meganum is ready to test your wits and to get started you need to choose a mathematical operation: subtraction, addition, multiplication or division. Next, select the size of the field from the three options and you can get down to business. After choosing, you will receive a set of numbered green squares, and some numbers around the perimeter. The task is to ensure that the presence of numbers on the perimeter corresponds to the number of values on the squares, depending on which action you have chosen. For example, if you choose addition, then the sum of the vertical and horizontal squares must equal the number outside the box opposite each line. You must remove the redundant ones and complete the task in Meganum.