I made this absurd-looking Heyawake to teach myself the basics of what is known as "river theory". If that term is unfamiliar to you, then this blog post should be helpful.
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Rules
Shade some cells so that no two shaded cells are orthogonally adjacent and the remaining unshaded cells form one orthogonally-connected area. Numbered regions must contain the indicated amount of shaded cells. An unbroken horizontal or vertical line of unshaded cells may not cross more than one bold border.
Difficulty: 8/10
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