It exists in US arcades. It's a similar concept as an AIME card which you use to authenticate when playing maimai, chunithm, dance dance revolution, dance aroun

It exists in US arcades. It's a similar concept as an AIME card which you use to authenticate when playing maimai, chunithm, dance dance revolution, dance around, beat mania, etc. Triforce IC cards store data instead of just being for authentication.