Microsoft loves Grand Theft Auto IV. According to Microsoft, the Xbox 360 version of GTA IV accounted for 60 percent of total sales.

As a testament to GTA IV's addicting missions, side quests, and free-roaming adventures, Microsoft yesterday announced that the average gamer spent more than four hours playing GTA IV last week, the most of any other game.

Both Microsoft and PlayStation 3 manufacturer Sony depend on GTA IV to sell consoles, as can be seen by the many platform-specific advertisements in circulation. Sony also releases their own to promote the PS3, with never a mention of the Xbox 360 version, obviously.

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