| On the level "Tight", you can block off one entrance to the skinnier hall at the top, and just kill them in single file at the bottom. I just put it on Nightmare, and hold down spacebar with pistol. I only die because I get distracted and a red guy snuck through.
Also, you can hold down spacebar with pistol, and spam 1. It'll increase fire rate dramatically. You can also lay a bunch of charge packs by selecting a diff weapon after you drop one. Huge explosions with charge packs, barrels, and claymores. | 