Roblox is one of the world’s most popular kids’ games, but lawsuits around the country allege predators are hiding in plain sight.

DoctorRofatnik, known to fans as “Doc,” looked almost mayoral in a tall white hat, a red tie and an American flag pin. A smirk was permanently plastered on his face as he roamed his domain on Roblox, ...

I’ve arrived in the middle of a vast expanse of what looks like green LEGO plastic subdivided into fenced lots. Mozart’s “Turkish March” plays sourcelessly over a chorus of meowing cats and squeaking ...