XOR Grid

The player’s task is to help the four Dalton brothers escape from prison. The only way to do this is to completely cover the barred window so that no one can see the tunnel the prisoner is digging. The problem is that curtains are randomly placed in the individual window openings, and placing a new one causes the one adjacent to it, either horizontally or vertically, to be removed or added. With this in mind, you must strategise so that all the bars in the window are completely covered.