One of the latest hits from DeNA, a Japanese mobile-gaming company, is called "Blood Brothers". The hero is a vampire who unites his allies against his enemies in a pact of blood. But that's not the scary part. On Google Play, a social-gaming site where "Blood Brothers" is the current top-grossing American game, the fans' reactions include: "very addictive", "very fun and addictive" and "so addictive". Could it be that, after years of waning popularity, the world is once again falling in love with Japanese video games? And although reviewers have been jovially describing good games as "addictive" for years, might the fun be wearing thin? Are some of these new products so compulsive that people should worry about them?
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