Sum Square

Fill in the intersecting boxes with numbers such that each box contains the required sum.  Initial levels start out easy but the later levels can be very tough!  See if you can complete all 60 levels without using the Solutions button too much!

Each colored box has a required amount that the numbers in its box need to total.  Drag and drop the numbers until each colored box contains numbers with sums equal to the required number for that box.  Having trouble seeing the box boundaries?  No problem as you can just click on the number box to highlight its box.