Hold the following buttons before the corresponding level begins to start with a special weapon.
| Code | |
| Down | |
| Weapon 1 | |
| Up/Right + Weapon 1 + Weapon 2 | |
| Down/Left + Weapon 2 | |
| Weapon 1 | |
| Left | |
| Up/Left | |
| Left + Weapon 1 + Weapon 2 | |
| Down/Right + Weapon 1 + Weapon 2 | |
| Up/RIght + Weapon 2 | |
| Up/Left | |
| Right + Weapon 1+ Weapon 2 | |
| Up | |
| Up/Left + Weapon 1 + Weapon 2 | |
| Down/Left + Weapon 1 | |
| Right + Weapon 1 |
Beat one of the indicated levels in the following games to unlock a "Sound Remix" selection on the options screen, which allows a remixed version of the background music to be played.
| Game | |
| 1942 | |
| 1943 | |
| 1943 Dash |
| 1942 | |
| Infinite Lives P1 & P2 | 8006AF00 0003 |
| Infinite Credits P1 & P2 | 8006AC74 0003 |
| 1943 | |
| Infinite Lives P1 | 800D027E 0140 |
| Infinite Lives P2 | 800D02FE 0140 |
| Infinite Credits | 8008D2E4 0002 |
| Infinite Time For Special Weapons | 800D02CE 1F00 |
| 1943 Dash | |
| Infinite Lives P1 | 800D0C72 0140 |
| Infinite Lives P2 | 800D0CF2 0140 |
| Infinite Credits | 8008F714 0002 |
| Infinite Time For Special Weapons | 800D0CC2 1F00 |