Midway Arcade Treasures: Extended Play Cheats 

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Pixel Perfect mode:
Pause your game, then hold L + Down + Circle. You can then toggle screen sizes by pressing Square. REMEMBER: This only works in single player mode, and has no effect in the Mortal Kombat games or Cyberball 2072.

Mortal Kombat 3: Kombat Kodes:
Press the following buttons at the VS screen to activate the following Kombat Kode.

Unlock Smoke: Press HP(1), BL(9), HK(2).
Unlimited run: Press LP(4), BL(6), LK(6).
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).
Fight Motaro: Press LP(9), BL(6), LK(9).
Fight Shao Kahn: Press BL(3), LK(3).
Fight Smoke: Press LP(2), LK(5).
Play Galaga: Press LP(6), BL(4), LK(2).
Fight Noob Saibot: Press LP(7), BL(6), LK(9).
No life bars: Press LP(9), BL(8), LK(7).
Throws disabled: Press LP.