If you don't mind brushing the dust off a "classic", you can download the Marathon trilogy for FREE. The majority of regulars here joined during the Halo years and [i]may[/i] not have played much of their earlier works. Personally, I've poked around in Durandal a bit, but that's about it. To me it feels a bit like running around in DOOM again. What you can expect are trademark Bungie elements. Blasting enemies who laugh in alien tongues, rampant AI, punching buttons (one never pushes buttons), the "carnage per minute" ratio, lasers, mystery, power suits, and classic sci-fi action. http://trilogyrelease.bungie.org/