Fortnite allows players to compete against each other on various platforms including Playstation, Xbox and even a cellphone.
In December, Epic Games, which owns the game, said 200 million unique users have played Fortnite since its launch.
“It’s created to addict, an addiction to keep you in front of a computer for as long as possible,” Prince Harry said of the game. “It’s so irresponsible. It's like waiting for the damage to be done and kids turning up on your doorsteps and families being broken down."
Harry visited the YMCA in an event sponsored by Heads Together, the mental health initiative spearheaded by Harry, Duchess Meghan, Prince William and Duchess Kate.
Harry’s comments about social media came just days after he and Meghan launched their own Instagram account, @sussexroyal, that has quickly amassed nearly 4 million followers.
“Let’s keep reminding each other that it’s OK to not be OK, and to listen to each other,” Harry captioned an Instagram post featuring photos of his visit to the YMCA. “After all, how we think determines how we act, how we feel, and how we treat ourselves and those around us.”