The grid is covered by plates, each two squares long. Some are magnets — one end positive (+), the other negative (−) — and the rest are blank.
Magnets push apart when like signs meet, so two + ends (or two − ends) can never sit side by side across a square’s edge. Corners are fine.
The numbers count the + ends in each row and column (left and top) and the − ends (right and bottom). Rows and columns with zeros are the best way in.
Decide which plates are magnets and which way round they go: like signs never touch, and the numbers count the + and − ends in each row and column.
The full guide, with a worked example and common mistakes: How to play Magnets.
Yes — only squares sharing a side count as touching.
No — every puzzle has its own arrangement of plates.
Yes — every puzzle here is checked to have exactly one solution.
Open the Magnets Solver, draw the plates, type the counts and press Solve.