Guinness World Records today announced that Grand Theft Auto IV sold 3.6 million units and earned $310 million in its first day of release, earning Guinness World Records for the Highest Grossing Video Game in 24 Hours and the Highest Revenue Generated by an Entertainment Product in 24 Hours. These records establish GTA IV as the most profitable entertainment release of all-time, far surpassing other video game, film and book releases.