Pixel Perfect mode:
Pause the game, then hold L Down Circle. You can now toggle screen sizes by pressing Square. Note: This only works in Single-Player mode, and has no effect in the Mortal Kombat games or Cyberball 2072.
Kombat Kodes in Mortal Kombat 3:
Activate the following Kombat Kodes by pressing the corresponding sequences of buttons at the VS screen:
Infinite run – Press LP(4), BL(6), LK(6)
Play as Smoke – Press HP(1), BL(9), HK(2)
Fight Galaga – Press LP(6), BL(4), LK(2)
Fight Motaro – Press LP(9), BL(6), LK(9)
Fight Noob Saibot – Press LP(7), BL(6), LK(9)
Fight Shao Kahn – Press BL(3), LK(3)
Fight Smoke – Press LP(2), LK(5)
Dark Kombat – Press LP(6), BL(8), LK(8)
Psycho Kombat – Press LP(9), BL(8), LK(5)
Randper Kombat – Press LP(4), BL(6)
Blocks disabled – Press BL(2)
Player one has 1/4 energy – Press LP(7), LK(4)
No life bars – Press LP(9), BL(8), LK(7)
Throws disabled – Press LP