5. Grand Theft Auto - 76 million
With the release of Grand Theft Auto IV video game records were smashed worldwide. Selling 3.6 million units within 24 hours of release the game (Guinness Book of Records) has made the "highest revenue generated by an entertainment product" in that time period. And it just keeps selling!
GTA's references to films such as 'Scarface' and 'Goodfellas', Hollywood A-list vocal talents and playful nods to certain fashions and times have made this a big hit with a huge following. The game's notoriety for its violent game play and indifferent attitude to crime can only have helped its sales.