Filling - Puzzle Game

You have a grid of squares, some of which contain digits, and the rest of which are empty.

Your job is to fill in digits in the empty squares, in such a way that each connected region of squares all containing the same digit has an area equal to that digit.

To play Filling, simply click in any empty square and then type a digit on the keyboard to fill that square. By dragging, you can select multiple squares to fill with a single press.