Magnets

Dominoes that are magnets or blanks. Match the + and − counts, and never let like poles touch.

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How to play

The grid is tiled by dominoes. Each is a magnet, one half + and one half −, or a blank.
Numbers beside rows and columns count the + and − squares in them. Some numbers are hidden.
No two + squares and no two − squares may share a side, even across different dominoes.
Tap a domino to cycle: + −, − +, blank, undecided.
Every puzzle has one answer; a hint fixes a wrong domino or sets a correct one.