Legally, the creators have sold more than 13 million copies, however, the PC edition was also downloaded more than 4 million times illegally and the Xbox edition was downloaded around a million times, taking the total illegal downloads to more than 5 million.
Few more games were downloaded more than 2 million times for PC, they include The Sims 3, Prototype, Need for Speed Shift and Street Fighter IV. Most of the same games were also downloaded for Xbox 360.
Surprisingly, the most pirated games in 2009, were all released in 2009 itself. Unlike earlier years where older games were pirated more frequently.
Another interesting fact is that, the most pirated games are actually PC downloads, rather than for gaming consoles. This might be due to the recent crackdowns on cracked consoles by Microsoft.