3 Fill each domino shape with either a magnet (consisting of a + and
4 − pole) or a neutral domino (green).
6 The number of + poles that in each row and column must match the
7 numbers along the top and left; the number of − poles must
8 match the numbers along the bottom and right. Two + poles may not be
9 orthogonally adjacent to each other, and similarly two − poles.
11 Left-click a domino to toggle it between being empty and being a
12 magnet (the + is placed in the end you click). Right-click to toggle
13 between empty, neutral, and a ?? mark indicating that you're sure
14 it's a magnet but don't yet know which way round it goes.
16 Left-click a clue to mark it as done (grey it out). To unmark a clue
17 as done, left-click it again.