Survival DLC features:
- 3 Custom maps added only to the SURVIVAL mode
- 3 Playable characters with various combat statistics
- Ranks system that includes: unlockable perks and specials, unlockable weapons, and items of mass destruction
- New leaderboards and achievements
- Cheats including infinite ammo, god mode, any weapon pickable
- New difficulty modes including Story and Insane
- Steam Cards
- Additional sub-quests for some levels
- Multiple bugs fixes and performance improvements