Collector interest
Taito sequel from 1988 sold in Japan with the Vaus rotary controller, an accessory whose presence governs the value of a complete set. The cartridge alone stays common, but a boxed copy gathering game, paddle and intact manual thins out markedly, since the controller was often separated or broken. Desirability rests on that hardware dependency: it is the integrity of the Vaus set, more than the game, that drives the value up.