Fortnite shoots to the top of teenagers' most-wanted games list

Players snap up clothing items as iPhone version of free video game tops iTunes chart in 13 countries

A year ago, no one had heard of Fortnite, the online shooter game in which 100 players fight it out to be the last person standing. Now it is the biggest video game in the world, with an obsessive fanbase among schoolchildren and teenagers.

Previously only available on consoles and PC, last week an iPhone version was given a limited release - and within hours it topped the iTunes chart in 13 countries. According to the market research firm Sensor Tower it made $1.5m (1m) in revenue for Epic Games, its developer, in its first three days.