Available for download on the XBox Live Arcade this week is the winning entry in the Doritos’ Unlock XBox Challenge contest Microsoft hosted millions of years ago (well, okay, sometime last year). You now can be the proud owner of Doritos’ Dash of Destruction, in which you play as a rampaging T-Rex with a jones for nachos or as a Doritos delivery truck fleeing from a dino with the munchies. Before you scoff, you should know that the download is completely free. At least it looks better than Yaris! Early word is that the 200 achievement points are easier to unlock than opening a bag of chips.