Speed RUN! (contains spoilers)

[Heero]

1) Go get rebreather from cave.
2) Go into shovel cave, toss logs into cave, enter cave. Use logs and sticks (build bird cages) to go over the wall. Run by all enemies and grab shovel. Run back, use grenade at location to exit cave.
3) Use shovel to get Maintenance keycard. Use Maintenance keycard to get VIP keycard and Guest Keycard (In multiplayer, 1 person needs 1 key card only.
4) Grab gold armor and katana. Go for the legs, it's very effective with the katana.
5) Find end bunker and finish the fight.

The only real stops are the rebreather and keycards.

[Tiedeman]

Speed runs are lame.