XCOM Enemy Within

Developer: Firaxis Games 
Publisher: 2K Games
Similar Game: Omerta - City of Gangsters
Genre: Strategy

XCOM: Enemy Within is the expansion to the 2012 Game of the Year award-winning strategy game XCOM: Enemy Unknown. Enemy Within adds an incredible array of new abilities, upgrades and weapons to combat new enemy and alien threats. This expansion also introduces new maps and missions, new tactical and strategic gameplay, and new multiplayer content providing a fresh new gameplay experience.

Minimum Requirement:
Windows Vista/7
Pentium Dual Core 2.0 GHz
2 GB RAM
20 GB hard disk space
512 MB Video Card (ATI Radeon 2600XT or NVidia GeForce 8600GT)