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.

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.