In XCOM 2, the player-character is the commander of the XCOM military organization that is now reduced to a resistance force opposing the ongoing alien occupation of Earth. Played from a top-down perspective, the game uses turn-based tactics in which players issue commands to a squad of human soldiers to eliminate the aliens in a map and dependent on missions, complete secondary objectives. Many of the missions are timed, requiring players to complete it within several turns. Maps are procedurally generated to create a wide variety of levels. Every map features different terrain and buildings in each playthrough. The game offers four difficulty settings: Rookie, Veteran, Commander and Legend.