In this study, the researchers looked at the types of gambling activities that are related to a greater likelihood of problem gambling in Japan, and how this might differ by age and gender. The researchers analyzed data from 12,955 participants between 15 and 82 years of age who had gambled in the past year in Japan. Participants completed an online survey about their demographic characteristics and gambling habits in February 2023. Online sports betting, offline and online casino gambling, and cryptocurrency trading were associated with a greater likelihood of problem gambling. Females who engaged in these activities were more likely than males to experience problem gambling. Younger people who engaged in offline casino gambling were more likely than older people to experience problem gambling. The findings can inform public health policies in Japan that regulate and restrict gambling activities.