XCOM: Enemy Within - Xbox 360 A valuable new alien resource, known as Meld, has been discovered. Secure it on the battlefield and use it carefully back at base to unlock new research and upgrades. Adopt new tactics to counter the threats from two new alien types - the Mechtoid and the Seeker - and a deadly new organization known as EXALT. Cloak-and-dagger and intelligence operations provide new tactical challenges on over 40 new battlefields. Create your custom squad from a wider array of options and dominate your opponent in intense, one-on-one, turn-based matches. Construct the Genetics Lab to physically enhance your operatives abilities including augmentations to the chest, brain, eyes, skin, and legs.