Game was pretty easy. Once I got the hunting rifle I didn't use anything else. I intentionally let them break the barricade and left it destroyed the whole time. Runners slow right when they get to where it should be, you just one shot headshot everything. 28 days.
I found, as impossibly difficult as this sounds, that on that puzzle where you have to play four way pong, you just need to try a few times to get the ball going completely vertical. Once I got it to just go straight up and down, you just slowly take your hand off the mouse and watch yourself win.
 "Help! It's the Unfinished Shadow Game"){kind=icon}
 "The Last Stand 2"){kind=icon}
 "me and the key"){kind=icon}