And things don't get much more screwed up than Bioshock Infinite, with a brain twisting final act that I'm pretty sure I still don't understand. If you've never had the chance to visit the floating metropolis of Columbia or you want to get behind Booker DeWitt's guns again, there's never been a better chance as the game is currently free on Xbox Live Gold. It's a terrifically fun shooter with plenty of inventive death-dealing, especially when you combine your guns with the increasingly over the top powers you'll gain as you progress.You'll also get to interact with Elizabeth, a NPC companion who bucks the trend by not only being well-written and engaging but also genuinely useful in a fight thanks to her special abilities. It also helps that she's generally invulnerable. Did we also mention that the game looks absolutely stunning?