One number will be missing in each row and column. Your task is to enter the missing numbers, but so that the sum of the numbers within each row and column is equal. You can enter a positive or negative integer value or zero. Note that there are several correct solutions to this problem.

Your task is to use the "drag and drop" action to move these numbers to a position so that the sum of the numbers in each row and column is equal.

When you are done, click the button at the bottom right of the screen to display the next task.

It is not allowed to return to the previous task.

As the demo mode is on, the correct solution will be displayed in each task.

Results by items:

For each completely correct item, the number of points is obtained, which is equal to the number of elements of the matrix (number of rows × number of columns). Otherwise 0 points.