Released: 2003
Developer/Publisher: Bungie Studios for Microsoft Game Studios
Platform(s): XBOX, PC

Before Halo, anything by Microsoft was pretty much a joke. After Halo...well, there's the Zune. OK, not really, but this now-legend FPS was Bill Gates' moment in the gaming sun, and was the title that finally made that gigantic controller make sense. It's actually a love/hate relationship, because we aren't really sure if we're gonna need those hundreds of hours of our lives back. Break out the bong. Discuss.

YOU AUGHTA KNOW:
Two friends from the University of Chicago started Halo's parent company, Bungie, in 1991. It had a series of "eh" moments until it was acquired by Microsoft in 2000 to make the game that would launch the Xbox.