Mortal Kombat: Armageddon brags a roster of 62 characters and sees the return of classic ones from the original Mortal Kombat, such as Reptile, Shang Tsung and Goro. The enhanced Konquest mode (story/adventure mode) improves over the preceding versions, but has a shorter length. There are now 64 arenas (including revamped versions of classic environments) which each have their own tweaks, such as the ridiculous amount of stage fatalities (fatalities are a fancy way of killing your opponent, including classic techniques such as the "spine-rip" or "arm-break").

In the new Kreate-a-character mode, you can design your own character and clothe them with familiar or new costumes. As described earlier, fatalities are a fancy way of killing your opponent and are pretty fun to watch. Various button presses and combos at the end of a fight will sometimes trigger fatality mode and if the right buttons are pressed the fatality can become a chain of fatalities. The Kreate-a-fatality allows you to redesign these finishers.