Everything you need to know about Fortnite and why it's so popular

When the University of Maryland-Baltimore County basketball team pulled off the greatest upset in NCAA history, player Nolan Gerrity had the perfect metaphor for what he was feeling. "It's like your first Fortnite victory, honestly," he told reporters. For those out of the know, it was a puzzling statement. But Gerrity's example made perfect sense to the 150 million people worldwide who have launched the video game Fortnite into an international obsession this year. Fortnite has been described as a cross between Minecraft and a shooter game. Survival is the name of the game.