Slice the grid into rectangles

🟦 Shikaku

Divide the whole grid into rectangles so that each rectangle contains exactly one number — and that number equals its area. Drag to draw, tap a rectangle to erase. Puzzles are generated by really cutting a grid, so every one is solvable.

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Drag from one corner to the opposite corner to draw a rectangle. A rectangle turns green when it holds exactly one number equal to its area. Cover the whole grid with green rectangles to win.