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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.
Left-click a clue to mark it as done (grey it out). To unmark a clue
as done, left-click it again.
Full instructions
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(last modified on Mon Mar 9 01:42:11 2026)