Grand Theft Auto V holds the record for the fastest-selling video game, generating $800 million in its first day and selling over 11 million units within 24 hours. Call of Duty: Modern Warfare 3 sold 6.5 million units in the UK and North America on launch day, making it the fastest-selling overall video game at the time. Diablo III also saw massive success, selling 3.5 million copies in its first 24 hours.