The game SUM+SUM offers you to solve a mathematical crossword puzzle. At each level you will receive a field of tiles with numbers. The vertical cells on the right and the horizontal ones at the bottom are the target amounts. From the numbers on the main field, you must create amounts that match the target. By clicking on the cells, change their color to green and if the final amount is equal to the target, it will also turn green. If your move is incorrect, click on the square again to cancel it. The red color of the cell means deleting it, green means saving it, and the cell under the main color of the field cancels both actions in SUM+SUM.
