It took less than eight weeks last summer for Pokemon Go to attract 500 million users (called “trainers,” in the game’s parlance), representing a scale that Facebook took six years to achieve. Despite such astonishing growth, many people wondered if the frenzy was simply a digital fad for the ages. But then researcher Sensor Network estimated this month that the augmented-reality game had already made $1 billion—in its first seven months. Some fad. Now the blogosphere is abuzz about 80 new monsters in Pokemon Go’s second version, which went live last week.