Mortal Kombat X is delivered as Steam cd key after your purchase. Mortal Kombat X activation and installation is done entirely on Steam. Internet connection is required. Who’s Next? Experience the Next Generation of the Fighting Franchise. Mortal Kombat X combines unparalleled, cinematic presentation with all new gameplay. For the first time, players can choose from multiple variations of each character impacting both strategy and fighting style. Buy Mortal Kombat X, start fighting right away.