GAME GENIE CODES: Gain Ground. |
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| No. | Code | Effect |
| 1 | D3GA-AAE2 | 30 seconds to complete round |
| 2 | HVGA-AAE2 | 1 minute to complete round |
| 3 | MKGA-AAE2 | 1 minute 30 seconds to complete round |
| 4 | SBGA-AAE2 | 2 minutes to complete round |
| 5 | 0VGA-AAE2 | 3 minutes to complete round |
| 6 | 8BGA-AAE2 | 4 minutes to complete round |
| 7 | 97GA-AAE2 4 | minutes, 15 seconds to complete round |
| 8 | AVGA-AA8E | Infinite time to complete round |
| 9 | AK9T-AA5E | Must get everybody to the exit to complete round |
| 10 | SB9T-BLXE | Each dead enemy counts as 2 |
| 11 | SB9T-BRXE | Each dead enemy counts as 3 |
| 12 | SB9T-BWXE | Each dead enemy counts as 4 |
| 13 | SB9T-B0XE | Each dead enemy counts as 5 |
| 14 | SB9T-B4XE | Each dead enemy counts as 6 |
| 15 | SB9T-B8XE | Each dead enemy counts as 7 |
| 16 | SB9T-BCXE | Each dead enemy counts as 8 |
| 17 | SAYT-BJVE + SAYT-BJVJ | Play every other stage (1, 3, 5, 7 . . .) |
| 18 | SAYT-BNVE + SAYT-BNVJ | Play every 3rd stage |
| 19 | SAYT-BTVE + SAYT-BTVJ | Play every 4th stage |
| 20 | SAYT-BYVE + SAYT-BYVJ | Play every 5th stage |
| 21 | SAYT-B2VE + SAYT-B2VJ | Play every 6th stage |
| 22 | SAYT-B6VE + SAYT-B6VJ | Play every 7th stage |
| 23 | SAYT-BAVE + SAYT-BAVJ | Play every 8th stage |