Play FEAR Extraction Point. I'm on the final level, a rooftop area with DOZENS of enemies, some in the powered armor and such. I come out the door, nail one guy in the head with the Heavy Penetrator (A single headshot instakills with it) and shoot his buddy down. I've only got three clips for it, so I circle around a big obstacle thing, and run forward. One Replica is running to my left, on a catwalk about level with the platform I'm on. He passes just behind some pipes as I come out, so I slow mo, and drop down behind the pipes, using them to screen myself, then fire into his back. Another Replica comes out on the catwalk, and one pops up in a window at the end of the catwalk, so I gun them both down, and two more drop down to my level on the right of me. I spray them with heavy nails, and realize I have 12 rounds left, so I turn, shoot another Replica in the head, and AS HE IS FALLING, I SNATCH HIS GUN OUT OF HIS HANDS, turn, and gun down another Replica.
A door blows open, and I switch to my minigun, step around the corner and blow two Replicas and their Heavy Armor away in a half a second. Then, I dash up the stairs, melee another Replica to death, and turn the corner to find... A heavy armor Replica with a minigun. We both unload the miniguns into one another, but I win the little battle, and rush through the hall to where the chopper is waiting... Game over!
Note, this was one life, on my first try ever, and I beat the last level of the game in about 20 seconds or so.
FEAR.