Cut the grid into rectangles. Every rectangle must contain exactly one number, and that number is the rectangle's area in squares.

• Drag across the grid to draw a rectangle; click one to remove it.
• A 7 or any prime must be a 1×7 strip — those are your anchors.
• Corners are strong: a number in the corner has very few shapes that fit.

Shikaku (四角に切れ, "divide by squares") is a Nikoli classic: every puzzle here has exactly one solution.