Secret trailer
Wait roughly one minute at the main menu to watch a longer, uncut television trailer for the game.

Hints & Tips

Get Whitley to follow you
This trick requires Stun Grenades (found in the back of the room with Boss 3), Blood Test Kit (found in the same room), and the Grenade Launcher (in the save room down the hall from Boss 3). Starting after the third Boss fight (hanging tentacle monster), retrace your way out of the weapons lab, back up the air vent, and to the "mine" elevator. As soon as you get to the surface, strafe left, and equip both the Grenade Launcher and Stun Grenades. If you step forward at all, it triggers an intermission sequence and you will have to die and start the level over. Enter first person mode and aim up the corridor, parallel with the bottom of the last metal wall panel. Launch a grenade and swiftly walk forward. The intermission sequence will trigger, but Whitley will stand still instead of running off. Now, swiftly run ahead of him (preferably block his path to slow him down) and use the Blood Test Kit. He now trusts you enough to follow orders. Order him to follow you (otherwise he walks around the corner triggering guards to attack) and give him a weapon. You will now have a backup. He only lasts a short amount of time, and will disappear  halfway up the snow corridor, which appears scripted. However, every bit of backup firepower will help in this spot.

In the final level where you have to locate Whitley as an objective, as you stand in the elevator strafe left and launch a grenade just outside the opening. If done properly, you can bring Whitley with you to help kill all the troopers. Note: You have to give him some type of weaponry.

Persuade a person
When someone's trust is in the orange and they will not do anything for you, enter first person mode and aim the gun at their head for three seconds. They will now do things for you without good trust.

Get a doctor to follow you into a fight with the Thing
Use this trick to get a doctor in the same room with you when in your battle with the second giant Thing. Walk to the big garage door. Get the doctor close to the door also. Then, tell him to not follow you. Push him as close to the door as you can and close enough to you that when you flip the switch to open the door and he will not move. Before you flip the switch, tell him to follow you. Flip the switch and when you are shown in the locked room with the second giant Thing, he should be by you. Use him to heal you in the fight with the Thing.

Skip first Boss battle
When you come across the first Thing Boss, hold Up/Left to run diagonally and you should run under it before he can hit you. This will also aim you straight at the junction box. Start fixing it right away. As soon as it is about fixed, hold Right to run through the door. Since he will still keep fixing it as long as you do not let go of the button, with any luck it will be fixed before the Boss attacks for the third time. At the intermission sequence you tend to take off in a random direction, so this may take a few tries save immediately prior to trying this. If finished, you will lose roughly half a bar of health and no ammunition, making the next area a lot easier.

Beating the second big Thing
Proceed into to his garage. Fix the electrical panel that works the hoist. Step back towards the center of the big door. There is an opening between two of the crates. Using your grenade launcher in first person targeting, launch a grenade in. If the Thing turns its head toward you, then you have him targeted. Continue sending in grenades until he starts to burn. You can send in a few more if you like for extra fun. Run into the Thing's room and on the far wall from the big door is a switch. Throw the switch and watch as the Thing dies. You will most likely take one hit from him.

Use all 25 of your grenades from behind the crates.

When you are in the big door, use the earlier described trick to bring the medic in with you. Then use your sniper rifle to shoot it to get its attention, then shoot at it for some time with any of the guns. Next, get between the crack of the two crates close to the winch power box and go into first person mode. Aim at the ground with the flamethrower and the Thing will catch on fire. Just make sure to have lots of flamethrower ammunition in order to do this.

Beating the third Boss
Run around the Boss in a circle while shooting it with the machine gun. When it get's low on health, use the flame thrower to finish him. If done properly, you can kill it without receiving a hit. After you kill the Boss, the Thing in the glass in the room will break out, and the door will be opened with a few guards.

This Boss has a weak spot. If you get directly under it, it will not strike. When you get under it, blast away until its health is in the red, then burn it.

Place Peltola in front of you in the room, just before you enter the room where the Boss is at. Inch him into the doorway. When the door opens all the way, push him in and fire at the same time. He will enter with you and fight. Use him for his fire power and to keep the walker busy while you attack the big Boss. Peltola will die in the battle.

Two medics
In the level where you have to locate Faraday, do not hit the switches until you have met the medic downstairs. Bring him up to the top of the ramps and tell him to stay there. Hit the switches and go to locate Faraday. Leave, and on your way out, the medic will not have turned. You will get two medics for the rest of the level.

Keep Williams
On the level where you have to gain access to the weather station, go to the side of the building on your right. Throw a grenade under the vent and the door will be blown off, allowing you in. If you had gone in normally, Williams would have turned into a Thing. Using this trick will save a lot of medikits for the levels ahead.

Shutting doors
Remember to always shut the door of the room you walk into, if you have the chance. For example, on the level where you have to kill all the walkers, a walker will enter from the front door if you do not close it.

Keeping your team together
Always listen to your team. They will tell you how they feel. If you hear someone say something similar to "We're gonna die", check the team menu and see how he is doing. If there is an X across his face while he is shaking wildly, bring out the Tazer and shock him. Wait for him to calm down, move out of the area, and return his gun. He might be bitter, but after you kill a few more things he will be ok. Otherwise, he might start shooting you and your team, ending with himself.

Road tunnel
In the level where you first go into the road tunnel, go right to the truck. Blow up the barrel to kill every little thing. You can now either have an engineer fix the lights or not. Follow the left wall back to the door you came in and stop by it. There is a Walker locked up in some boxes. Throw a grenade to blow up the box and let the Walker out. Run back to the truck, or even better, stand there and watch (if the lights are on). The guards not only get killed, but really wear the Walker down. After he kills the guards, get him to walk around to you (not leaving the area) then blow up the barrel. If you done properly, you will kill the walker with ease. If not torch him.

Medi-Packs
Always try to keep medics alive because medical packs can be really hard to find. If you want your medic to heal a member of the team, tell your team to stay put, then push your medic into the wounded team member. If he is hurt badly, the medic will heal him.

Saving ammunition
Try not to give all your team members identical weapons because your ammo will go fast. A good combination is you with a Shotgun or Machine gun, your second man with the one you are not using, then a Pistol. The rest depends on the supply of ammo.

Being watchful
Pay close attention to your team. If you see someone doing weiird things,like not shooting at enemies when they appear, or moving rather far away from you when your walking, be on alert as this could be a sign of infection. However, do not waste a Blood Test Kit on him to see if you are right. Just be on alert because they could mutate at any moment. This also goes for you if your team sees you doing the same things, they will question your trust and may come after you.

Unlimited flares
Highlight "Flare", activate it, but do not throw it down. When it is low, press Left or Right and highlight another object. Then, highlight "Flare" once again. It will have restarted and you will not lose any more.

Blood Test Kits
Save Blood Test Kits for showing your team that you are not infected to gain their trust. Using them on a team member is worthless because they get infected at random, and usually break out within a minute of infection.

Beating the final Boss
Get yourself in the helicopter. When the pink tentacle appears from its back, fIll it up with lead. Then, hit the mouth area. When you get knocked to the ground or near it, blow up one of the barrels and watch it burn. Redothis until an intermission sequence starts. 032;

When you do kill every sniper sitting on top of the building, go back inside. Get warmed up and run to the left of the building where the snipers where at. When you go down the trench, a few intermission sequences will start. You will be in a helicopter. You do not need to have any life to beat this Boss. When you fly towards the creature, you will see a pink tentacle show up. Shoot it. After you shoot the tentacle and it sucks back in, aim the machine gun to the ground and shoot the four groups of barrels. You should be able to shoot all the barrels on the first try, but make sure to shoot the tentacle first before you go for the barrels. After all four groups of barrels are on fire and burning the creature, you will make three or four passes shooting the creature and the tentacle.

Level 6 (Strata Medi-Lab)
When your on the level where you start with no weapons, go toward the spark and fix the junction box. Then open the door where the walker is at, run behind the table, and wait for him. Now run out where he was and close the door. He will be trapped in there for a bit. Grab the ammunition by the dead body and go to where the medic is at. Note: Do not turn on the switch that is on the side of the camera. Give him the ammunition and have him follow you. Then g down the hallway. There will be an explosion, but it will not hurt you. Go beyond it, then go forward until you see the man. Do not open the door. Fix the junction box and open the door on the left. Save and grab the medi packs in the room. Have your man remain there and close him in. Return to where you trapped the walker and open the door. Then run to where you found the medic and have him come in. Then, go past him and look at him just inside the door. Just as he attacks, retreat, strafe right, and lock him in. Return to your man and he will heal you. Then have him follow you. Go back in the room with the "probe table" and open the other door. Two scuttlers will attack you, but your medic will kill them. Take your medic outside the door by the walker who was trapped. Have him remain there. Then, return and open the big door. You will see experiments everywhere, but there will be a hurt man in the back. Heal him, then run over to your medic. Tyhen close the door and make sure your men are with you. Then have him fix the junction box that goes to the armory. A few Scuttlers will attack, but just go in and get yourself equipped. Give one man a pistol, a bit ammunition to your medic, and ammunition, a medi pack, and flamethrower for yourself. Go to the man you saw behind the door. Take out your machine gun and open the door. Now shoot him until the aim becomes red, then change to flamethrower and burn him. Then, go in. You will need to go to the room on the left and hit the first switch and the last switch. Then, go through into the room. There will be a few Scuttlers here. Kill everyone, then open Cell 6. Only have him come with you. Return to the save room and save the game. Then, go beyond the save room to the door that will not open. Have your men remain there. Go to Cell 3 and look in the back. There is a vent. Shoot it open while in first person mode. Crawl through, and on the other side, walk across. There will be two flame grenades. Grab them. Look down to see two walkers. Jump past them and run to the door on the left behind the wall thing. Have your men follow you. Now take out the flamethrower and kill the walkers. Note: Just save the flame grenades, as they will help at the next Boss. Once they are dead, head in and have your engineer fix the junction box. Then get on the computer and get the code for the elevator. The elevator is where the man transformed at.