GAME GENIE CODES: Mortal Kombat 3. |
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| No. | Code | Effect |
| 1 | DM2A-JA3Y | From the main menu, press A or B or C twice to bring up each of the three secret menus. |
| 2 | C5ZT-GA28 | Player 1 takes all damage |
| 3 | RHZT-G6T8 | Player 2 takes all damage |
| 4 | AMZT-GA5E | Both players take no damage |
| 5 | ACXT-KA62 | The first fight for player 1 is against Kano |
| 6 | AGXT-KA62 | The first fight for player 1 is against Sonya |
| 7 | ALXT-KA62 | The first fight for player 1 is against Jax |
| 8 | ARXT-KA62 | The first fight for player 1 is against Nightwolf |
| 9 | AWXT-KA62 | The first fight for player 1 is against Sub-Zero |
| 10 | A0XT-KA62 | The first fight for player 1 is against Stryker |
| 11 | A4XT-KA62 | The first fight for player 1 is against Sindel |
| 12 | A8XT-KA62 | The first fight for player 1 is against Sektor |
| 13 | BCXT-KA62 | The first fight for player 1 is against Cyrax |
| 14 | BGXT-KA62 | The first fight for player 1 is against Kung Lao |
| 15 | BLXT-KA62 | The first fight for player 1 is against Kabal |
| 16 | BRXT-KA62 | The first fight for player 1 is against Sheeva |
| 17 | BWXT-KA62 | The first fight for player 1 is against Shang Tsung |
| 18 | B0XT-KA62 | The first fight for player 1 is against Liu Kang |
| 19 | B4XT-KA62 | The first fight for player 1 is against Smoke |
| 20 | B8XT-KA62 | The first fight for player 1 is against Motaro |
| 21 | CGXT-KA62 | The first fight for player 1 is against Noob-Saibot |
| 22 | HW1T-KAA4 + AC1T-JAA6 | All fights after 1st are against Kano |
| 23 | HW1T-KAA4 + AG1T-JAA6 | All fights after 1st are against Sonya |
| 24 | HW1T-KAA4 + AL1T-JAA6 | All fights after 1st are against Jax |
| 25 | HW1T-KAA4 + AR1T-JAA6 | All fights after 1st are against Nightwolf |
| 26 | HW1T-KAA4 + AW1T-JAA6 | All fights after 1st are against Sub-Zero |
| 27 | HW1T-KAA4 + A01T-JAA6 | All fights after 1st are against Stryker |
| 28 | HW1T-KAA4 + A41T-JAA6 | All fights after 1st are against Sindel |
| 29 | HW1T-KAA4 + A81T-JAA6 | All fights after 1st are against Sektor |
| 30 | HW1T-KAA4 + BC1T-JAA6 | All fights after 1st are against Cyrax |
| 31 | HW1T-KAA4 + BG1T-JAA6 | All fights after 1st are against Kung Lao |
| 32 | HW1T-KAA4 + BL1T-JAA6 | All fights after 1st are against Kabal |
| 33 | HW1T-KAA4 + BR1T-JAA6 | All fights after 1st are against Sheeva |
| 34 | HW1T-KAA4 + BW1T-JAA6 | All fights after 1st are against Shang Tsung |
| 35 | HW1T-KAA4 + B01T-JAA6 | All fights after 1st are against Liu Kang |
| 36 | HW1T-KAA4 + B41T-JAA6 | All fights after 1st are against Smoke |
| 37 | HW1T-KAA4 + B81T-JAA6 | All fights after 1st are against Motaro |
| 38 | HW1T-KAA4 + CG1T-JAA6 | All fights after 1st are against Noob-Saibot |