The venerable slot machine is undergoing a generational shift. For more than a century, since its invention by a German immigrant named Charles Fey in the 1890s, slot machines have required little more than cash, faith and an ability to pull a lever or push a button.
But now, a new class of machines, aimed at attracting younger players who grew up with video games, is demanding something else -- skill.
Adding an element of hand-eye coordination, however simple, is just one...
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