Enter the following codes on the password screen for the desired effect -

NXCVSZ: Unlimited urns
GTTBHR: 1000 lives
GRVDTS: View credits
ZCHRRY: The "Ultimate" Cheat (Transport to Level 8: Shinnok's Fortress. if you die before you reach a checkpoint, press L1 to fight Quan Chi or L2 to fight Shinnok).
RCKMND: View the exploding Earth Boss

Level Passwords:
2 THWMSB
3 CNSZDG
4 ZVRKDM
5 JYPPHD
6 QFTLWN
7 XJKNZT

Fatality:
Remember the head rip fatality? (Forward, Down, Forward, HP) You can perform this throughout the game. Try it on Scorpion at the end of Level 1.