Roblox has been slammed as a "hunting ground for child-sex predators" in a new lawsuit against the online gaming giant that alleges it caused the sexual exploitation of a 9-year-old boy.

Roblox is no longer allowing users under the age of 13 to message others outside of games and experiences on the platform.

Roblox cut its annual bookings forecast on Thursday, fanning concerns about a slump in the videogame industry and sending its shares down 23% to mark their worst day in more than two years.