The origin of this puzzle is not known.
Puzzle and Goal
An unsolved puzzle consists of a rectangular grid filled with two-cell regions. There are numbers on all four sides.
The goal is to place plus and minus signs in some of the cells to satisfy the clues.
The solved grid must satisfy the following conditions:
Some regions represent magnets, with one positive (+) cell and one negative (-) cell.
The numbers to the left and top represent the number of positive cells in the corresponding rank.
The numbers to the right and bottom represent the number of negative cells in the corresponding rank.
Two cells with the same charge cannot be orthogonal neighbors.
Magnete; Magnetfeld; Magnetplatten