Damn, seriously. First thing I did after watching that vid was hightail it over to VGMCentral and search like madman for that song.
Too bad I couldn't find it
Okay, hard stage... Timesplitters II: ROBOT FACTORY on Hard. Playing the game on hard is awesome, I was amazed at how I was utilizing EVERYTHING in the stages. Level design was superb, and I can honestly say it's the last great FPS ever made... until you hit Robot Factory. It's just so unconventional. You're shooting the sci-fi handgun in close quarters, and I always get hit by my own shots. THOSE DAMN SENTRY BOTS take a trillion hits to kill, and you can't even get a good shot hiding from them (if you can see it, it WILL be shooting at you). I still haven't beaten it, haven't even made it to the checkpoint

.
Jam it back in, in the dark.