Amber Petersen of Raleigh said her 7-year-old was playing a virtual character on the game "Roblox." Explore >> Are your kids safe? Predators reaching children through online games.

SAN FRANCISCO—At the Game Developers Conference Monday, Roblox rolled out a new set of AI tools designed to let the company's millions of player-creators create usable game code and in-game 2D ...