Pachinko machines have many themed varieties. They all accept little metal balls and resemble vertical pinball machines. The balls fall though pins and collect in different areas. The object of the game is to capture as many balls as possible.
Pachinko advertising makes the game look sexy and appealing.
The reality is that pachinko parlors are unbelievably noisy and smoky. There's nothing sexy about them.
Gambling is technically illegal in Japan. Inside the pachinko parlor balls can only be exchanged for superficial prizes such as t-shirts.
There is always a small "shop" just outside that exchanges the balls for cold hard cash.
Pachinko has been part of Japanese culture since before WWII. They aren't likely to go away anytime soon. Pachinko is one of the great Japanese passions.