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Heyawake (38)

Other names: Heyawacky

Instruction:
Shade some cells so that all other cells are connected orthogonally and no two shaded cells share an edge. The grid is divided into regions by thick borders; a number in a region indicates exactly how many cells in that region must be shaded. (Cells with numbers may or may not be shaded.) A group of unshaded cells connected to each other only horizontally or only vertically is called a "word". No word may cross more than one thick border.

Reference: WPF (1)

Examples:
WPF Puzzle GP 2014 - Round 4 (90)
WPF Puzzle GP 2017 - Round 3A (29)
WPF Puzzle GP 2020 - Round 1 (140)
WPF Puzzle GP 2020 - Round 7 (146)
WPF Puzzle GP 2022 - Round 4 (184)
WPF Puzzle GP 2025 - Round 7 (236)
Child puzzles:
Heyawake (Domino)
Related puzzles:
Starwacky