Four Hong Kong teenagers have been arrested in connection with nine cases of “hacking” game machines at various branches of a popular indoor arcade chain, allegedly collecting HK$20,000 worth of prizes. The group of three boys and a girl allegedly bought wireless devices online and used them to tamper with at least nine game machines at four branches of the chain, which the Post learned was Jumpin Gym USA. The chain called police earlier this month after spotting suspicious operations of some...