BFG (M249 SAW) in City Streets level
Enter "5SQQ-5THA-ZFFV-7XEV" as a profile name. If you entered the code correctly, you will be able to re-enter an actual profile name after selecting "Done". When you begin the first level, you will have the BFG weapon. Note: Make sure to include the "-" symbol when entering the code (located next to the "!" symbol).

Alternately, enter one of the following profile names:

3K67-9J5G-NSQH-G49M
3ZEQ-JXH9-TR2H-Y87D
5Q9E-4SEK-FJVV-C5HV
6DEG-7W3X-RKJF-TDF4
8PPV-J8SY-KA8T-BPYK
9NDH-293Y-P6MJ-829Q
EG4P-ZGUJ-6SQJ-3X68
FG6S-WFZG-7MDP-PZGT
G68Y-X5LB-N8PE-9D7N
HQ6G-ZP3B-C5LE-WMXA

Silver weapons
Successfully complete the game on the Normal or Hard difficulty setting to unlock silver weapons with infinite ammunition for that difficulty and any lower difficulty setting(s). Note: This does not include the Black Ops difficulty setting. You will always have silver weapons on that difficulty setting.

M16A2
Successfully complete the game on the Black Ops difficulty setting to unlock the M16A2 (M16 with grenade launcher) for use on any difficulty setting.

Black Ops mode
Successfully complete the game on the Hard difficulty setting to unlock the Black Ops difficulty setting.

Faster M16A2 reload
Immediately after shooting a round with the M16A2, switch weapons then quickly switch back and the grenade launcher will be reloaded.

Red and black shells
When reloading the Remington shotgun, the shells are red. However, sometimes the shells are black, and there are no black shotgun shells in the game.

Defeating enemies
Use destructive objects to your advantage to shock, hurt, or even kill enemies.

Defeating enemies with shields and body armor
Head shots do not work on enemies with full body armor; just shoot. For enemies with shields, use grenades or RPGs. Or, get behind them and kill them by shooting them in the back.

Defeating RPG troopers
The easiest way to kill RPG troopers is to wait until they fire a round (pop out then hides behind something). While they are reloading, shoot at his midsection. If successful, you will shoot and detonate the RPG he is trying to reload, blowing him up.

Burnout reference
During the final battle there is a safe (one of the secondary objective items) on the left walkway. If you destroy the safe, a message similar to "'You have destroyed Secret Burnout Renders" will appear.

Aurora stealth plane reference
In the first mission, on any difficulty setting other than Easy, you can destroy Intel as a secondary objective. One of those Intel-containing laptops once destroyed holds information on an "Experimenting aircraft code named 'Aurora'." The "Aurora" is supposedly a real, yet secret, aircraft. Most of the Intel is real or based on real world information.

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