Rules & objective
Divide the board into rectangles. Each rectangle contains one clue equal to its area. Tap two corners to place it; tap an existing region to remove it.
Controls
Tap two corners to place a rectangle; tap a region to remove it; Esc cancels the first corner.
Worked example
A clue of 6 can occupy a 2×3 rectangle. That rectangle must contain exactly one clue and cannot overlap another rectangle.