Cheat code: Effect:

give all All weapons

devmap [map name] Change maps

notarget Disable AI

god God mode

mapname List maps

noclip No clipping mode

Level Select Codes
First unlock the game's console by going to Game Options and
select "Yes" for the Game Console. Next open it up with the ~ key.
Then, type in these codes to go to the level.

Devmap see2 Play the mission Blood and Iron

Devmap pel1a Play the mission Burn 'Em Out

Devmap ber2 Play the mission Eviction

Devmap pel2 Play the mission Hard Landing

Devmap pel1 Play the mission Little Resistance

Devmap pel1b Play the mission Relentless

Devmap ber1 Play the mission Ring Of Steel

Devmap mak Play the mission Semper Fi

Devmap see1 Play the mission Their Land, Their Blood

Devmap sniper Play the mission Vendetta

Modes
Complete certain objectives to unlock different game modes.

Veteran mode:
Reach Level 32 to unlock Veteran mode, which is a Co-op mode with
much tougher enemies.

Zombie mode:
Successfully complete Campaign mode to unlock Zombie mode, which
is a four-player Co-op mode against endless waves of Nazi zombies.

Cheats for RUSSIA vs. GERMANY levels
Go into the options menu and enable the game console, then
(in menu or gameplay, it doesn't matter) press the ~ key to open it.
Type the password for each level to play it on cheat mode.

Devmap see2: Play the mission Blood and Iron
(VEHICLE LEVEL)

Devmap ber3b: Play the mission Downfall (FINAL USSR LVL)

Devmap ber2: Play the mission Eviction

Devmap ber3a: Play the mission Heart of the Reich

Devmap ber1: Play the mission Ring of Steel

Devmap see1: Play the mission Their Land, Their Blood

Devmap sniper: Play the mission Vendetta

Devmap nazi_zombie_prototype: Play the Nazi Zombie game extension