found at Mighty Ape
XCOM: Enemy Within – Commander Edition – a standalone pack that expands the XCOM: Enemy Unknown experience featuring the new XCOM: Enemy Within content and the add-on content that was previously released for XCOM: Enemy Unknown, including the Elite Soldier Pack and Slingshot Content Pack.
XCOM: Enemy Within takes the experience from XCOM: Enemy Unknown and adds an array of new abilities, upgrades, and weapons to combat new enemy threats. The expansion also provides players with all-new maps, tactical and strategic gameplay, and multiplayer content. Fans will experience an additional three to four playthroughs on average before encountering all of the new material included in XCOM: Enemy Within.