I have no idea why or how ABC Family, rather than Nickelodeon, is presenting this new quiz show, which premiered last week, because it has Nick written all over it: Contestants, most of them young, try to compete in a spelling competition while being assaulted by all manner of sounds, sights, liquids and other distractions. Had this been a Nick show, there definitely would have been green slime. But as family-viewing summer diversions go, why not? Can you spell “instructive,” boys an