Interactive magic squares

Fill in the blank squares below each image and click "Check" when you're finished.
A magic square is a table where all rows, columns, and both diagonals add up to the same number.
Solving a magic square can be a bit tricky, but if you follow a specific order, you shouldn't have any problems.
If you get stuck, start by solving the sum of some of the complete rows or columns.
Once you've done that, you can then calculate the value of a column or row that only has one unknown square.
As you figure out the value of each image, you'll be left with a new row or column with just one unknown value.