1.split the whole grid into rectangles.

2.every rectangle must contain exactly one number clue.

3.the rectangle’s area must equal that number.

4.drag across cells to draw a rectangle; tap a rectangle to remove it.

5.you win when every clue sits in its own matching rectangle.

big numbers have few possible shapes — place them first.

a clue of 1 is always its own single cell: tap it.