Ian Stepp remembers visiting his aunt’s house as a kid, where he’d play classic games like Duck Hunt and iterations of the Mario Brothers saga on the family’s trusty old Nintendo Entertainment System. Now pushing 30, Stepp is still a fan of the now-classic video games that in recent years have spawned a thriving culture and industry capitalizing on the nostalgia of grownups who coveted Nintendo game systems as kids in the 1980s and 90s.