Button Sequences:
Forward -- F
Back -- B
Up -- U
Down -- D
Attack 1 -- A1
Attack 2 -- A2
Attack 3 -- A3
Attack 4 -- A4

Default Characters:

Bo' Rai Cho:
Belly Flop: B, B, B, D + (A4)
Johnny Cage:
Brain Ripper: B, F, F, D + (A2)
Kano:
Open Heart Surgery: F, U, U, D + (A1)
Kenshi:
Telekinetic Crush: F, B, F, D + (A3)
Kung Lao:
Splitting Headache: D, U, B + (A3)
Li Mei:
Super Crush Kick: F, F, D, F + (A4)
Mavado:
Kick Thrust: B, B, U, U + (A1)
Quan Chi:
Neck Stretcher: B, B, F, B + (A3)
Scorpion:
Spear Head: B, B, D, B + (A4)
Shang Tsung:
Soul Steal: U, D, U, D + (A2)
Sonya Blade:
Kiss of Death: B, F, F, D + (A2)
Sub-Zero:
Skeleton Rip: B, F, F, D + (A3)

Unlockable Characters:

Cyrax:
Claw Smasher: F, F, U + (A2)
Drahmin:
Iron Bash: B, F, F, D + (A3)
Frost:
Freeze Shatter: F, B, U, D + (A1)
Hsu Hao:
Laser Slicer: F, B, D, D + (A2)
Jax:
Head Stomp: D, F, F, D + (A2)
Kitana:
Kiss of Doom: D, U, F, F + (A2)
Nitara:
Blood Thirst: U, U, F + (A1)
Raiden:
Electrocution: B, F, F, F + (A3)
Reptile:
Acidic Shower: U, U, U, F + (A3)