1. Reprogram Shuttle Guidance: easy, medium, hard 
2. Launch Shuttle: easy, medium, hard 

This level is one of the coolest, but also one of the more task-oriented, and you'll need to do some backtracking amongst this many room Complex. You'll also meet Jaws! 

You start off in a small door frame, with guards to your left and to your right. There are fewer to the right, so strafe out pointed to that side, kill the guard there, rush toward his collapsing body, grab his gun, and then spin around and hide behind the nearest pillar, a few steps from him. The remaining living guards have grenades and aren't always that athletic about handling them (sometimes they blow themselves up). But beware just the same. If you hear that little clinking sound, you know to run and hide. If they don't throw grenades right away, they will approach you and start shooting. Kill these two guys off, and then head toward the opposite side of the room. 

A shadow on this wall highlights the secret door which opens by pressing B. Inside the next room, which is bigger than the previous one, you'll look through a stone hallway. One guard will stand directly in your way, so kill him immediately and then look out in the distance and you'll spy one more guard to the far left. Kill him while two more fill the hallway. Knock them off without advancing. Now move about three-fourths of the way down the hallway, staying to the right. A guard in the distance on the right is hiding behind unbreakable crates and has a perfect view of you. Unfortunately, you don't have the same view. There's one on the left but he's father off. Lean out and let him give away his location. Then lean and shoot him off. Again, beware of these guys because they have grenades, and they're slightly better at throwing them. 

After pegging this guy, move out and to the right and hide behind the nearest pillar. There should only be one soldier remaining, hiding on the far left behind steel crates. Run to the pillar parallel to the one you're hiding behind (on the left side), and pick off the last guard. Now you can breathe for a moment. Take a look around. There are two parts to the room, separated by a deep crevice in the middle. From here there are two ways to go, and one is definitely better than the other: you can drop down the gully, or take the secret door across the chamber. Either way you chose, you'll get to the same place, it's just that the path via the secret door is much more manageable. A lot more manageable. (Just for fun though, drop down the gulley and you'll end up facing jaws -- from the 007 movie Moonraker. You'll face him eventually, but this way you'll see him much earlier.) 

Press B to open the door and play a little trick. Run into the large, dark control room about two steps to let the guards on either side know you're there. Then quickly step back into the hallway. This forces them to come to you, and you can then just pick them off in the hallway. There are at least four more guards in the hallway, and you'll need to trip them up, too. After those two are down, run in and into the first three-sided 'room' or 'slot' on the right and reload your weapon. At least three guards will appear slowly from the other little slots. Pick them off as they approach you. There are at least three, so when you believe the coast is clear, snoop carefully across other little slots to make sure they're all gone. 

In this control room you can see computer panels behind a glass encasement. That's where you will set the data to reprogram the Space Shuttle. Also you'll pick up another important document, a DAT for launching the shuttle. but you must first face jaws to acquire a Security Smart Card. So, turn around. A control panel in one of the slots to your right has a flashing red button on it. This should look familiar. Hit the button and a giant computer on the wall will open up, revealing a secret pathway. Inside is at least one guard. Use your rifle site to quietly pick him off. Then enter the area. Pick off any other guards you see. Follow the hallway and open the next door on the right; at least three soldiers guard this hall. Pick off each one quietly, one by one, by placing a bullet in their heads. 

Follow that hallway, and turn right at its end. You'll face a strange room with two computer panels on the far side of the room. Quickly step in and out and let the two guards on either side of the entrance come to you. Kill them, spy guy. As soon as you do, the floor and roof will transform and a message will tell you that the shuttle is about to do fire its engines (or something), which will kill you instantly. But it won't if you do something simple: Blow up the computer console on the far right wall. And then enter into the hallway behind it. Strangely enough, there's a labyrinthine corridor behind it. Hmmmmm... 

Enter in and follow it to the first left, and take it. Then take your first right and hold your spot. Beyond you is a long hallway with two automatic machine guns and a few guards running your way from the left. Let the three or so guards come to you, and kill them. You should pick up their guns and one will be the Moonraker Laser with unlimited ammo! Yes! This is just short of having the Golden Gun. Now move up to the T split in the hallway, where, on your left is an auto gun facing away from you. Lean out and shoot it. Do the same to the one on the right. Check to make sure no guards are coming your way, and then run right to the end of the hallway to pick up a piece of body armor. 

Now, you're ready to make your assault. Walk down the hallway containing the broken auto guns and follow it to the end. You can pass through a ventilation door, but don't just yet because there are four motion sensitive auto guns in the area. Strafe to the left and inch forward halfway down this hall until the nearest gun is activated or you see it through the door, then shoot it. Then move up to the ventilation door and peak out right -- an inactive auto gun is hanging on the wall to your right about five feet away. Kill it. There are two more hanging high on the walls to your right. From behind the door you can blow up the one on the left as well as the more difficult one on the right. A few stray soldiers will approach the door and shoot in; kill them off. There are at least three soldiers with lasers hiding behind steel crates against the wall on the far right, so take them all out. The coast should be clear. You should have a grenade by now. Keep it until later, when you meet Jaws. Now move toward their carcasses and pick up their weapons and then head toward the Space Shuttle on the other side of the room (notice the mainframe on your right, you'll need to go back to it later). Half way to the space shuttle is a ladder that leads up to a control panel. Go up and hit the button which will close the exhaust doors and also open up a necessary door you've already been through. 

Now to meet Jaws. After descending the ladder, turn your back toward the vent door from which you arrived. A similar door is on the opposite side of the room. Go through it, take a left, kill any guards around you, and descend the stairs. Take a step to your right and, facing the same way, go forward until you reach a right turn that looks through a high, narrow passage. At the end of the tall, narrow crevice is a huge room that opens up and which contains Jaws and a few other soldiers. Jaws takes a million hits, unless if you hit him in the mouth (or face), but he still takes a bucketload either way. Use the attention getting trick (walk out so he can see you and then slip back) and lead him into the narrow hallway. Back up, switch to the grenade and throw it so that when Jaws walks in, he gets it. He'll easily survive, but you'll have taken some life out of him. Then back up out of the hallway to your right, and use your Rifle. (We use the rifle because it's a non-stop weapon and the laser takes a millisecond between shots, allowing Jaws some time to recover; use the weapon of your preference, but at least you know ours.) When Jaws turns the corner, aim for his head and pummel him until he drops. He usually gets a few shots in so be careful and hide behind walls. Now, pick up his weapons and the smart card you've been needing. Kill any other guards in the area and run back to the vent shaft, cross the room (a few guards will be there), and enter the vent shaft from whence you first came. Follow it all the way back to the control room with the glass doors. 

We're finally getting something done now. There are two things you must perform once you've opened up these glass doors: Pick up a DAT on the right table; and reprogram the Space Shuttle. So go ahead and pick up the DAT, and then switch to the Guidance Data via your watch and slip it into the computer terminal on the table to the left. Objective A will have been met. 

Now, go back to the Shuttle Room, where you'll once again meet up with a bunch of ingrate soldiers, and ascend the ladder so that you can once again open up the exhaust doors, and then head toward the computer terminals on the far end of the room. Go to the mainframe (remember?) on the right and toggle to the Launch Protocol Data you picked up in the glass-encased control room. You'll have to do this quickly because a few stray soldiers will shoot at you from behind. If you've done it correctly, a timer will set off, and you'll have approximately 30 seconds (or so) to run out of the room and keep yourself alive while the shuttle launches. If you're alive when it does (and the exhaust doors are open), then you have beaten the level. Nobody does it better.