These are puzzles based on the concept of Magic Squares. Users take turns swapping elements until the numbers in each row and column sum to the number in their goal cell, which is located in the last column or row of the grid.
Users can determine their progress the numbers in the next-to-last column, which tells the current sum of the numbers in that respective row or column.
To swap two numbers, first click on a cell with one of the two numbers in it. The cell should then turn red. Then click on the cell with the other number in it and the numbers should swap. If you click on the same ecell twice no action should take place (except for the cell to turn red and then blank again).