This page is dedicated to the 2004First Person Shooter (FPS) game Doom 3. Outlined in this guide are step-by-step tactics to 100% completion of each area, item and weapon locations, boss battle strategies, fighting strategies for enemies, PDA locations, and cheats ranging from obtaining all weapons to God Mode.
This walkthrough is broken down into the basic areas - Mars City, Delta Labs, etc. Each area is thoroughly detailed, and information on weapon locations, PDA locations, and other tips are given. A list of cheats is available at the end of the walkthrough, for those of you who would rather stock up sooner than later. This guide assumes that you are playing on NORMAL difficulty on your first playthrough, but can be used for higher difficulties as well - enemy locations may differ, enemies are stronger and faster, and ammunition is more scarce at higher levels.
Controls
These are the default controls.
Left Thumbstick: Move; click to crouch
Right Thumbstick: Look around; click to zoom view
Back Button: Save / Ready
Start Button: Pause
Left Trigger (LT): Sprint
Right Trigger (RT): Action; fire weapon
X Button: Reload
Y Button: Select previous weapon
B Button: Select next weapon
A Button: Jump
Black Button (BB): Bring up the PDA; check score in multi-player
White Button (WB): Turn flashlight on/off
NOTE: These controls can be customized in the control configuration menu. This guide assumes default controls.
Doom 3 Overview
Below are explanations of the basics of Doom 3 - how to read your map, how to access your PDA, etc. Refer to this information to help adjust to the controls of the game, and to make gameplay easier.
Combat
Doom 3 is an FPS (First Person Shooter), so you'll be using a variety of firearms to defeat enemies. This is accomplished by placing your reticule over the enemy and firing - however, it's not always just a matter of "point and shoot" tactics. Some enemies will attempt to avoid your gunfire, others will attempt to surprise you; still others will fire at you from elevated positions. To succeed in Doom 3, there are three tactics that you need to remember and use often.
Reload when not in a firefight: Every chance you get, check your ammunition. Reload every time you finish killing an enemy - the last thing you want is to suddenly walk into a boss fight with a half-emptied clip. This guide provides warnings for bosses ahead of time so you can have the appropriate weapon ready and reloaded.
Collect and conserve: This goes for ammo, health, and armor - avoid incoming fire, and don't let melee enemies get close enough to hit you. Use headshots to take down enemies quicker to conserve your ammo - you'll need it for the bigger enemies and boss fights later on. Don't use the BFG against zombies, for example.
Keep your eyes open: Many times, you'll be attacked from a position that, looking back on it, you knew an enemy would be there. Stay sharp, and keep on the look out for enemies that haven't noticed you yet - sometimes enemies won't attack until you get within a certain range of them, for example. Try to check and clear rooms as you progress - this helps with tactic #2 above.
Healing
There are a few different ways to heal in Doom 3:
Small Medkit: Heals a small amount of health.
Large Medkit: Heals a greater amount of health.
Adrenaline: Gives you unlimited Stamina for a short period of time.
Try to conserve your Medkits - if you don't need it, don't use it. A good way to look at it would be if you are more than 70% your total health; don't bother healing unless you're going up against a boss. If you drop below 70%, use a Small Medkit, and so on.
PDA
The PDA (Personal Data Assistant) is an important tool - you'll use it to watch videos, receive incoming transmissions, record data like lock combinations, and find other sorts of useful information. Finding and collecting other PDAs scattered throughout the game increases your PDA's available information.
Flashlight
The flashlight is an under-rated tool - you can use it to scout out dark places, and it does a great job of killing standard zombies in melee combat, conserving your ammo for more important enemies. You don't need to collect batteries for it, so keep it available - it's extremely useful for finding Medkits in dark halls.
Oxygen
When you go through an airlock into the open space of Mars, you'll notice that you have a limited amount of oxygen - you don't have to restore it with oxygen tanks, it automatically replenishes once you return inside. However, if you stay outside too long, your oxygen will run out, and you'll begin to take damage until you either return to the limited safety of the base or die.
Keys
Keys are used to open locked doors - not all locked doors are opened with a key, however. Some require a keypad combination, usually stored on a PDA somewhere nearby. When you do run across a key, make a mental note of it - they typically lead to important things, like weapons, ammo, PDAs, or switches. Most locked doors, however, are opened with security clearances you've stored on your PDA.
Backpack
During the course of the game, you'll acquire a backpack to store more items at once. Basically, it allows you to carry more ammo than before, so once you find it, stock up on ammunitions.
Ammunition
There are several kinds of ammo in Doom 3 - no more "these five guns use the same bullets" scenarios. You'll find the following types of ammunition for their respective guns:
Bullets: Pistol ammunition
Shells: Shotgun ammunition
Cells: Plasma Gun ammunition
Chaingun Belt: Chaingun ammunition
Clips: SMG ammunition
Energy Cell: BFG ammunition
Rockets: Rocket Launcher ammunition
Note that your fists, Flashlight, and Soulcube don't have an ammo type - the first two are melee weapons, so you won't have to worry about them. The Soul Cube is charged with kills - for every five demons you kill with another weapon, you'll be able to use the Soul Cube. This doesn't stack, however - killing ten demons doesn't mean you can use it twice in a row.
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