1. Destroy illegal arms cache: hard 
2. Destroy computer network: medium, hard 
3. Obtain safe key: medium, hard 
4. Recover helicopter blue prints: medium, hard 
5. Locate Trevelyan's train: easy, medium, hard 

Secret Weapon: Rocket Launcher!  
Correction: In order to beat the Agent 00 in this level, you must first find and destroy the illegal arms cache. Instead of running to the computer network area straight off, take a right where you would have taken a left, and run to the second warehouse on the right. Kill off the three to four guys there and then pick up the Rocket Launcher! Yeah, baby! Then destroy the cache from up on the bridge using a rocket, but don¹t use the second one. Finish off the cache with any other gun. (Save the other rocket for the computer network auto gun). Once this objective has been completed, then stay cool -- and hidden -- once you open the warehouse door. Enemies will be crawling on all sides. Once the coast is relatively clear, head up to the computer network and follow the rest of the guide. 

The first goal is to get bigger weapons quick. In the easy mode, go to the far all, and behind a crate on the right is armor. Three crates past that on the left is your first Russian victim. Take his gun, a D5K Duetsche. In the medium level, you need to obtain a safe key and blow up some computers. In the easy level, you simply have to find the train. Now back up a few steps after the first kill, and at the opening take a left and start running. Skim the left hand wall until you reach a double gate fence. Open it and go through. Skim the left wall, to keep out of site. At the end of the path is a garage with a door, reading BXOII. Go to the far left side of the garage door, and angle your gun inside, then press B to open the garage. There are two guards. You'll have perfect aim at one. Kill him and step back to the wall. The other will step into view. Kill him. 

A large crate on your right will protect you from soldiers who'll run over fro the right when they hear the racket. Three to four other soldiers from inside the garage will appear. Kill them, and your right for more soldiers. A good place to couch yourself is in the crevice between the wall at your back and the crate on your right, which gives you a perfect angle of any newcomers. You can strafe left and right to see anyone who's coming from here. Try entering the room again as soon as the coast is clear (which won't be for long). 

Wait for the garage door to close, keeping the bad guys outside. Shoot the remaining soldiers by peaking and leaning around the giant gray wall of crates between you and a large, mean automatic machine gun. This auto gun shoots non-stop and will kill you within seconds. Once the soldiers all seem dead, play a little trick on the machine gun. Strafe to the right and let it see you and then quickly strafe to the left. It'll still be a second or so behind you. You'll have time to aim, and unload a flurry of shots. Destroying this auto machine gun is hard, and you may die a few times in the process. Aim upward to kill it. After it's dead, walk left and there may be one soldier remaining. Just be wary. You should be able to pick up a double D5K Deutsche now. The far table on the left should have a safe key, so grab it, and then blow all of the computer equipment away. Shoot the big screen, too. Objective A and B should have been met for the medium and hard level. 

Now, before you leave there are a bunch of soldiers waiting for you. So be smart. Open the door and lean out to kill the trio of guys waiting for you. When the coast seems clear, run straight down the path, past that earlier gate on the right and keep going until you reach a big clearing. The clearing is noticeable because of the orange-ish pipe that runs form building to building overhead. At that point, turn left there and head straight. 

There will be a few stray soldiers shooting at you so stay lean, mean, and run! Veer a bit to your left. You'll go about 100 feet or so, until you pass under another orange pipe. You'll see a white gate on your right and several graffiti-laden crates on your left. Pass through that area until a white building appears on your right. (in this area are at least two body vests and more soldiers hidden in between crates, but you may not really need the vests). Enter through the door on that building. Ascend the staircase and find the safe upstairs. Toggle to your safe key, choose it, press R, bottom C to duck, then press B and back up so that the door can open. Grab the train blueprints, having met objective C, and go out the nearest door. 

This door leads to the train. Open it, descend the stairs, and run toward the far left garage door. Open it. There may be one or two guards on your right to meet you. Kill them. The train is right in front of you. Walk toward to the yellow vertical stripes and press B. At least two guards will be there. Kill them. You're in and the mission is done.