Perhaps it would be prudent to have a go at XCOM: Enemy Unknown once again in order to pick up from where it left off as part of the new game’s preparation. Where the previous game was already notorious for its difficulty level, you can be sure that the gloves are going to come off in terms of the difficulty level this time round. Those who love a challenge would definitely want to experience it for themselves.
Basically, the premise of the new game sees humans being forced into slavery, although the XCOM organization is now a small pocket of resistance, being involved in guerrilla warfare style so as to obtain victory for humanity on the whole, hence a rather covert way the human operatives are dressed up in.