For coin-operated game equipment that does not fall under any other umbrella. Dome hockey and skeeball are two good examples. Novelty Coin-Op Games.
From the meaning of being unusual usage is derived the concept of the novelty dance (a type of dance that is popular for being unusual or humorous); the novelty song (a musical item that capitalizes on something new, unusual, or a current fad); the novelty show (a competition or display in which exhibits or specimens are in way some novel); and novelty architecture (a building or other structure that is interesting because it has an amusing design). (wikipedia)