There's a version of this game on x-box 360 (downloadable content, I think) which was mentioned on X-play (G4)-however, it lost none of its difficulty, based on what they said on the show...
Survival-200 kills...GAU-8 gets quick easy kills, plus it has 999 rounds per clip. drawback? obviously, it must have one; the reload time is a pain...so that's about it. good luck, and go FAST!
The game cheats. No, this isn't a disclaimer, but the game involves no luck whatsoever and it never plays fair. I get zilches no matter what I try to do. When the computer makes a stupid move, it has a high chance of success (last die gets a 5 or 1 miraculously) and yet when I try the same thing, it zilches me every freaking time!
Love the game, but cant collect all the parts ffs...tried to get the wtf and the bbq, but at least i got the omg...should have an imp badge for doing so and a med/hard for collecting all the upgrades-as an endurance challenge ^_^