XCOM 2: Tactical Legacy is an addition to the futuristic tactical strategy with turn-based combat in the XCOM universe. The game takes place between the first and second parts, and tells how Officer Bradford and the members of the XCOM squad fought against alien invaders before the events of XCOM. A new mode, "Legacy Operations", awaits you, in which new tasks, weapons, maps and armor are available.
The add-on requires the original version of XCOM 2.