Thanks, Walt. It would be nice if Storyline had an option to just randomize like they do questions in the freeform drag and drop. You're best building your own drag/drop interaction and using Walt's javascript to do the randomization at the moment. You also could drag, drop, and make another one pop up immediately if you trigger your javascript on every correct drop.
Of course, it'd be nice if you could define all your javascript variables and functions for a slide on the "on timeline start" and then access the functions and variables in other triggers on that slide. But I digress...
