hi,here's the list fo games that know.

1)MORTAL KOMBAT MUGEN PROJECT
2)ULTIMATE MK TRILOGY FOR GENESISI HACK
3)MORTAL KOMBAT DEADLY ALLIANCE(WIP interrupted,Frost is the only playable character)
4)MORTAL KOMBAT SIDE-SCROLL GAME(a demo is present on this community,if i'm not worng it should be called "konquest" but i'm not sure.
you can control Cage,Liu kang,kitana,rayden and kung lao)
5)MORTAL KOMBAT VS STREET FIGHTER(MUGEN)
6)MK BLOOD STORM(INCOMING WIP,SEE YOUTUBE FOR MORE INFO)

however i'm pretty sure that there's some other game or at least a more recent edition.
for example i'd like to know more things about the side-scrolling game and please give me a lin where i can download the game.