Enter a password below on the password screen for the desired effect. Please note, only one password may be active at a time.
| Password | Effect | |
| DESTR0Y ALL M0NSTERS | Start at lvl 8 and fight all the Bosses on Earth | |
| M0NSTER 0 | Fight King Ghidorah on Earth | |
| MAR | Start on Mars, second world | |
| JUP | Start on Jupiter, third world | |
| SAT | Start on Saturn, fourth world | |
| URA | Start on Uranus, fifth world | |
| PLU | Start on Pluto, sixth world | |
| NEP | Start on Neptune, seventh world | |
| X STAR | Start on Planet X, last world | |
| S0UND | Access the game's Sound Test Menu | |
| START T0 END | View the game's Ending | |
| GH1D0RA | Debug screen with unique music | |
