Unlock Survival Mode

First go into the War Room from the Main Menu. Then go into the Options screen. In the Options screen type in the password. The downside to the password is that it only lasts until you turn the game off. Once you turn the game on again, you must re-enter the code and any progress made before will be lost.

 

 

 

 

New Game Mode

 

 

 

 

Multiplayer weapon unlockables, Weapons Room (Bonus mode) unlockable

 

 

 

 

Bonus modes

Beat campaign on different difficulties.