The Jungle[edit]
The helicopter will drop you into the jungle with your companions John Turner and Nick Myer, after which you will automatically go north. In the next five screens, the area will automatically light up, as if you were using the Flare Gun, which you will get later in the game. In the first one, you will receive a call from the pilot, who will remind you of the purpose of your mission. Then go west. Here you have to be careful not to be seen by the enemies aboard the helicopters. If this happens, you will be forced to fight until you have killed all the enemies who rush to the place. Go north and then west. Other helicopters will patrol the area. Go north. Here the pilot will call you and inform you that you have ended up in enemy airspace and that he can no longer help you. Go north.
From here on, the screens will only be illuminated by enemy spotlights, making it difficult to find your way around. There will be three spotlights on each screen. Avoid entering the illuminated circles, or you will be attacked by enemies. However, if this happens, the entire screen will be fully illuminated. Go west and then north. Here you will find a ration. After grabbing it, exit and re-enter this screen. The ration will have appeared again, take it, then repeat the process until you have the maximum amount of rations you can have at your current rank, that is 3. This is a technique that you will have to use constantly in the game, for many other items. Once you have your fill of rations, go back to the first screen with the spotlights and go north. Go north again and you will have a chance to free a hostage. Go back and go east. Go north two screens, east and then north again. Free the hostage and go back. At this point, continuing east you will come to a dead end. Then go back three screens and this time go east. Go north. You will receive a call from John, who will tell you to hide at the main entrance. Repeatedly take the ammo until you have reached the maximum, which is 50, exactly as you did for the rations. Then go east, keeping close to the bottom edge of the screen. If you don't, the two soldiers guarding the door will spot you and attack you. If, on the other hand, you stay hidden behind the bushes, you will receive another call from John, who will distract the enemies and get caught. The gate to the enemy base will remain open and you can sneak inside.
The first building[edit]
Once inside, go south. Never use the gun yet, or the enemies will hear your shots and rush in. Watch out for the two enemies and exit to the lower left. Enter the open door to find Pass Card 1; take it and go back. Go back to the previous screen and this time exit at the bottom right. Open the door at the top with Pass Card 1 and enter. You can free a prisoner, who will tell you about the truth gas. At this point, go right as far as you can, ignoring the north paths for now and open the door on the right with the Pass Card 1. Inside you will find Pass Card 2. Now go back to the point where you entered the enemy base and open the north door with the Pass Card 1. In the next room open the door on the left with the same Pass Card and enter it. You will find yourself back in the jungle. However, this time you will notice the Silencer near the jeeps. Grab it and go back inside. Now you can use firearms without any problems. Open the north door with Pass Card 2. You will find truth gas. Enter and exit until you have 2. Now go back to the screen where there is access to the room where you got Pass Card 2 and go north. Open the door at the top right. Inside you will find an enemy hostage, who will tell you he knows nothing. Equip the truth gas and use it on him to force him to talk. At this point, you should have reached Rank 2. Exit and now reach the door on the left, to do so you will have to go back to the previous screen for a moment. Open it with Pass Card 1 and you can free a prisoner, who will inform you that John has been moved to another place. Then go left and enter the grate to the north. You will find yourself in a side scrolling area, but all you have to do here is get on the elevator and go down to the lower level.
Watch out for the two enemies and exit to the lower right. Follow the path until you reach a door, which can be opened with Pass Card 1. Inside you will find an enemy prisoner. Force him talk with the truth gas and he will tell you that their weapons have been shipped. Go back to where you got off the elevator and this time go to the bottom left. Follow the path until you get to a screen with two doors. In the lower one, which can be opened with Pass Card 2, you will find the submachine gun, while in the upper one (Pass Card 1 is required) you can stock up on plastic explosives. Then go to the top right. At the bottom you will find a door. Open it with Pass Card 1 and you can get an oxygen tank. You will have to hurry though, as the room is full of poisonous gas, which you will not be able to stop in any way. Unfortunately, it is better for you to enter again so that you have two tanks, because they will be very useful to you shortly. If you are quick you will not lose too much vital energy. Go back and this time go to the top left. Open the door with Pass Card 1. In this screen there are surveillance cameras, go through it without being seen and go south. Open the door with Pass Card 2 and you can fill up on ammunition and grenades. Go back and this time go right. Here, too, you have to pay attention to the cameras. Go to the grate above and go down to the lower level. Kill the two enemies in the room and exit south, to enter the first real side scrollig area of the game.
Side scrolling area 1[edit]
Go to the right, possibly crawling, so as not to be seen by the enemies. If you kill them with a gunshot before they see you, however, it won't be necessary. You will come to a screen with some water at the bottom: enter it quickly to avoid being seen by the camera. If you crawl in the water, your oxygen tanks will be activated automatically. You will have to do this to avoid the three floating mines. You will then have to go through a flooded tunnel. If you have taken at least 2 oxygen tanks, you will have more than enough. Continue to proceed to the right, quickly killing the enemies you encounter until you reach the end of this area.
Boss Fight - Assault Unit[edit]
As soon as you exit the side scrolling area you will have to face the first boss of the game. In this room you will be attacked by five robotic soldiers, which you will have to defeat. Better if you have a good supply of rations, because this is a very challenging battle. The robotic soldiers are deployed in a geometric formation and will attack coming towards you, and then return to their formation after a few moments. Avoiding their attack at first is extremely difficult, but if you move in the right way you can also succeed. To attack them, you should use the grenades you should have taken. When the enemies are stationary in their formation, take the opportunity to throw some grenades. Try to eliminate the one in front first. If you're accurate, you may even be able to hit more than one enemy with a single grenade. If your life energy starts running low, don't hesitate to use a ration. As you defeat the enemies, they will change formation and it will become easier and easier to avoid their attacks. When you run out of grenades, switch to the gun. By now, you should have eliminated enough enemies to avoid their assault easily, so just shoot them until they all are gone.
After defeating the assault unit, you can exit through the door above. You will enter a room with two enemies. Eliminate them, reach the elevator at the top and use it to go up to the upper level. In the next room, two orange squares will block the door on the right. Don't worry, you can eliminate them with your normal attacks, even if it will take some time. Use your fists or the knife to save ammo. When you have destroyed them, open the door with Pass Card 2.