A North Carolina woman was horrified when her 7-year-old daughter showed her disturbing graphic imagery while playing a user-created game on “Roblox.”

Amber Peterson explained in a public Facebook post that her daughter showed her a scene of her “Roblox” avatar being “violently gang-raped on a playground by two male [avatars].”

“Words cannot describe the shock, disgust, and guilt that I am feeling right now, but I’’m trying to put those feelings aside so I can get this warning out to others as soon as possible,” Peterson wrote on June 28. “Thankfully, I was able to take screenshots of what I was witnessing so people will realize just how horrific this experience was. … Although I was immediately able to shield my daughter from seeing the entire interaction, I am shuddering to think of what kind of damage this image could have on her psyche, as well as any other child that...