: Players can unlock secret battles against characters like Jade , Smoke , and Noob Saibot by meeting specific in-game requirements, such as winning rounds using only low kicks. Legacy and Availability

: Beyond the classic Fatalities, MKII introduced Babalities (turning opponents into infants) and Friendships (performing a non-lethal, humorous act).

: For the first time, players could compete against others globally. It included dedicated online leaderboards to track rankings against friends and the wider community.