Modern Warfare 2 was the most pirated game on the PC and the Xbox 360 this year. And Nintendo's New Super Mario Bros. was the most pirated on the Wii. Modern Warfare 2 sold 4.7 million units in the U.S. and the United Kingdom in its first 24 hours. But the pirates managed to get their hands on copies of the game before it went on sale and distributed it on the torrent networks, as we noted in our popular story on how private investigators tracked down a Modern Warfare 2 pirate.
There were 4.1 million unauthorized downloads of the PC version and 970,000 for the Xbox 360. That was more than double the number of pirated copies of Spore, which was last year's winner of the dubious honor of most-pirated game. But it's interesting that Modern Warfare 2 went on to break all records, selling $550 million worth in its first five days.