At the title screen use the left control pad to press Right (6), Left (3), Right (6)
At the title screen use the left control pad to press Up (3), Down (4)
Press Start to pause, then press Up, Left, Down, Right. To disable this code, press Up, Right, Down, Left.
Enter 4649 at the password screen and confirm by holding L + R + Select + A
Level Passwords for Jack Bros.
| Password: | Result: |
| 6313 | Crystal Palace (Jack O'Lantern) |
| 0531 | Crystal Palace (Jake Skelton) |
| 1309 | Dragon's Belly (Jack Frost) |
| 0919 | Dragon's Belly (Jack O'Lantern) |
| 9537 | Dragon's Belly (Jake Skelton) |
| 3267 | Grim Reaper's Cavern (Jack Frost) |
| 4965 | Grim Reaper's Cavern (Jack O'Lantern) |
| 0248 | Grim Reaper's Cavern (Jake Skelton) |
| 7285 | Mecha Fortress (Jack Frost) |
| 2827 | Mecha Fortress (Jack O'Lantern) |
| 3598 | Mecha Fortress (Jake Skelton) |
| 8453 | Temple of Nightmare (Jack Frost) |
| 5923 | Temple of Nightmare (Jack O'Lantern) |
| 2745 | Temple of Nightmare (Jake Skelton) |