Gambling in Japan is a curious mix of strict laws and quirky legal exceptions....

https://sticky-wiki.win/index.php/How_Does_Pachinko_Work_for_Beginners%3F

Gambling in Japan is a curious mix of strict laws and quirky legal exceptions. While most forms are banned, you’ll find popular outlets like pachinko parlours, horse racing, keirin cycling, and boat racing (kyoutei)