GAME's pre-order charts sometimes lump games into one. For example, GTA4 maybe the number 1 pre-order and it says PS3 but it also incorperates the Xbox version.
If you go to the Xbox 360 part of the site, you will see it is number 1. for Xbox 360 while on the mainpage it is not mentioned and other 360 games are in the chart.
Edit: GAME hasn't even pu GTAIV in the pre-order charts for the 360 for some reason. There advertising the PS3 version more too








