You’re standing in front of the door. Behind, a room full of ghosts is anticipating you. As soon as the door is opened, several monsters are appearing which are staring at you with their eyes. You’re not a fraidy cat, so you are taking up the challenge to chase away the ghosts. However, think of how to realize this as it is also about the title of „the best monster hunter” of the day, of the week or at all times at the same time. Therefore, one should obey the rules which say that demons can only be chased away pairwise.
Thus, one looks for two identical ghosts which can be connected with a line with maximally two edges, whereby no other monsters are allowed to be located in between. Regarding this, the kind of the line is playing a relatively important role. Are two monsters connected with a simple straight line, one is receiving only few appreciation and thus only few points. It looks different, if monsters can be connected with one line with one edge or even better with two edges. In this way, you already get much closer to the title „best monster hunter.”
One can definitely say that it is a logic and memory game which is suitable for children and more experienced players.