Shikaku

Goal: Divide the grid into rectangles and squares so that:

• Each rectangle encloses exactly one number.
• The total cell area of the rectangle matches that number's value.
• Rectangles do not overlap, and the entire grid is tiled.

Controls:

📱 Drag & Draw: Click/Touch a cell and drag to outline a rectangle. Release to finalize.

❌ Click to Clear: Tap any drawn rectangle to immediately delete it.

A rectangle of size 2x2 = 4 cells enclosing a single "4".