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Magnetic Field

Fill each domino shape with either a magnet (consisting of a + and − pole) or a neutral domino (green).

The number of + poles that in each row and column must match the numbers along the top and left; the number of − poles must match the numbers along the bottom and right. Two + poles may not be orthogonally adjacent to each other, and similarly two − poles.

Left-click a domino to toggle it between being empty and being a magnet (the + is placed in the end you click). Right-click to toggle between empty, neutral, and a ?? mark indicating that you're sure it's a magnet but don't yet know which way round it goes.

Courtesy of Simon Tatham's Puzzle Collection via the MIT license.

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