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Magnets (Toroidal) (1032)
Instruction:
The grid is partitioned into regions of two square cells each (note that only region borders are drawn). Put "positive" (+) and "negative" (–) symbols into some cells, at most one symbol per cell, such that each region either has two symbols or no symbols at all. Adjacent cells (even within a region) cannot contain the same symbol.
For each row and column, the two endpoint cells cannot contain the same symbol (as if the grid "wraps around" to the other side). Note that some regions also "wrap around" similarly.
The numbers above and to the left of the grid indicate the exact number of symbols of the specified type that must be placed in each column or row, respectively. If a number is not given, there might be any number of symbols of the specified type.