How to Unlock Survival Mode in "Call of Duty: Modern Warfare 2" for the DS
- 1). Go to the game's main menu. Select the "War Room."
- 2). Select "Options." Enter "Select," "L," "R," "Select," "Y," "Y," "X," "R," "L," "X," "R" and "Y".
- 3). Go to the main menu. Enter your game to play in Survival Mode.
Source...