Puzzle 202: International Borders

Here’s a sample for another new type on puzz.link: International Borders by Palmer Mebane; the implementation was contributed by Lennard Sprong. This is probably not the most gentle introduction to the type.

[puzz.link]

Rules Shade some cells to split the grid into edge-connected areas of unshaded cells (“countries”), one for each color ocurring among the clues of the puzzle. Clues are unshaded, and each country must contain all clues of the corresponding color. (Uncolored clues may belong to any of the countries.) Clue numbers count how many of the four adjacent cells are shaded. Furthermore, every shaded cell must be a border cell: it must have at least two unshaded cells that are part of different countries.

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