shithub: puzzles

ref: 88872fe806bb3700c8dc6372d66e1b6620f78da2
dir: /html/rect.html/

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docname=rect:Rectangles
<p>
Draw lines along the grid edges to divide the grid into rectangles,
so that each rectangle contains exactly one numbered square and its
area is equal to the number written in that square.
<p>
Click and drag from one grid corner to another, or from one square
centre to another, to draw a rectangle. You can also drag along a
grid line to just draw a line at a time, or just click on a single
grid edge to draw or erase it.