The exchange of prizes for cash was once controlled by the yakuza (Japanese mafia but has been cleaned up by the police, who now regulate it in this way. It sounds elaborate for a game, but pachinko is both big business and a national obsession.Japanese Pachinko players pony up far more cash annually than the combined gambling revenues reaped by Macau, Las Vegas and Singapore, Bloomberg reports. Before the recent legislation permitting casinos, legal gambling in Japan was restricted to playing Pachinko, buying lottery tickets, or betting on boat.The more balls they win, the more cash they will get. This pinball derivative played by millions of people in Japan has been popular in the country since the 1940s although today the machines are much more sophisticated and addictive than the original mechanized game.For more on the gambling industry, watch Fortune's video: Despite its apparent ubiquity, Pachinko is on the wane. It reportedly recoups around a third less money than it did at its peak in 2005, and there are now about 11,000 parlors in the country.Japanese people play with the pachinko gaming machines in a parlor in the Shibuya district of Tokyo, Japan. Robert AlexanderGetty Images. Last month, legislators in Japan passed a law that legalizes casino gambling in the country.For another, they supposedly involve some skill: below each spinning wheel is a button that stops it manually, meaning pachislo players earn their jackpots by hitting the button at the right moment.Apr 5, 2017. Premise. As someone who experienced the amazingness of Japan, and is fond of slots and casinos, this article store jackpot på slots caught my eye. An argument for.But that figure is a paltry sum compared to the 25 trillionequivalent to over 4 of Japan's GDPalready generated by the mainstay of the Japanese gaming sector: Pachinko. A game in which small steel balls ricochet frenetically around a sort of vertical pinball machine, Pachinko.