Listen up, Marine. It's time to take this battle to the enemy. No more playing defense on our home turf—in QUAKE 4, it's time to go on the offensive and attack the strogg on their grounds. Unfortunately for you, that means the battle is only going to get tougher.

The strogg are not a race to be trifled with. Their many forms make for various tactics and attacks, forcing you to constantly be on your toes. Think you have what it takes? We hope so. But you don't have to do it alone.

In this QUAKE 4 strategy guide, you'll find:

• Basic strategy to save your skin. Don't forget what we teach you.
• QUAKE 4 walkthrough with tactics for getting through every skirmish in every level.
• Boss tips—we figured out all of the bosses so you don't have to.
• Mulitplayer tip sheet for rookie QUAKE players.

Get the QUAKE 4 Online Strategy Guide

While playing press BACK (next to the X-GUIDE button) and input the following codes: (Unverified)

Load up ... UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, RED, GREEN
Restore life ... RED, GREEN, RED, GREEN, UP, UP, DOWN, BLUE
Restock ammo ... RED, GREEN, BLUE, YELLOW, LEFT, RIGHT, LEFT
Invulnerability ... DOWN, UP, DOWN, DOWN, UP, RIGHT, LEFT, RIGHT, YELLOW, BLUE, BLUE, GREEN

After you finish with the last tower (the Data Processing Security tower) go to lift just right before the level exit and save the game. Keep this save game alive so you can farm this file.

Pick a weapon in your inventory and exit the level. Upon loading the next map, do not change your weapon and proceed to kill the big monkey strogg enemy before you approach the tram and exit this map.

Simply reload the save game from the Data Processing Security tower and repeat the tram map with each weapon and you'll bag all the achievements quickly.