You've brought pachinko to mind: "Directly gambling on pachinko is illegal in Japan. Balls won cannot be exchanged directly for money in the parlor. The balls a

You've brought pachinko to mind: "Directly gambling on pachinko is illegal in Japan. Balls won cannot be exchanged directly for money in the parlor. The balls are exchanged for tokens or prizes, which are then taken outside and exchanged for cash at a place nominally separate from the parlor." (quote from Wikipedia)