These are the moves for Mortal Kombat 2. Only some of the special moves, and none of the finishing moves, are applicable to other MK games.

Special Moves
Fireball : Back, Back, High Punch
Two Fireballs: Back, Back, Forward, High Punch
Three Fireballs: Back, Back, Forward, Forward, High Punch
Morph into:

Liu Kang: Back, Forward, Forward, Block
Kung Lao: Back, Down, Back, High Kick
Johnny Cage: Back, Back, Down, Low Punch
Reptile: <Block>*Up, Down, </Block> High Punch
Sub-Zero: Forward, Down, Forward, High Punch
Shang Tsung: Up, Up, Down, Down, Left, Right, Left, Right, B, A, Select, Start
Kitana : Block, Block, Block
Jax: Down, Forward, Back, High Kick
Mileena: Hold High Punch for 2 seconds, release
Baraka: Down, Down, Low Kick
Scorpion: <Block> Up, Up </Block>
Rayden: Down, Back, Forward, Low Kick

Finishing Moves
Neo-style Execution: From about 2 steps away, hold High Kick for 5 seconds, release
Soul Drain: From very close up, <Block> Up, Down, Up, </Block> Low Kick
Kintaro: From about two steps away, release Low Punch after having held for the entirety of the last round
Babality**: Down, Back, Forward, Down, High Kick
Friendship** (rainbow): Back, Back, Down, Forward, High Kick
Dead Pool: <Low Punch> <Low Kick> Down + High Punch
Kombat Tomb/Pit II : <Block> Down, Down, Up, Down </Block>

* For those who've never seen html, <Block> and </Block> mean hold down Block and release Block, respectively
** Babalities and Friendships cannot be executed if you've used any punches in the most recent round