Alien Syndrome Classic Co-op
Sega Master System · cheat codes
Gain Ground cheats & codes
21 codes for Gain Ground on the Sega Master System, including Action Replay codes.
Gain Ground Action Replay codes
How to use: Datel's Action Replay sat between the console and the game. Enter codes on its menu before starting the game, or paste them into your emulator's cheat menu.
| Effect | Code |
|---|---|
| Infinite Time - One's Digit (P1 Only) | 00CF-E409 |
| Infinite Time - Ten's Digit (P1 Only) | 00CF-E509 |
| Infinite Time - Hundred's Digit (P1 Only) | 00CF-E609 |
| Infinite "STY" | 00CD-E709 |
| High "SCR" (1080ish) | 00CD-D980 |
| Number of Enemies Modifier | 00C4-D6XX |
Gain Ground Other codes
How to use: Additional codes collected by the community. Enter them through your emulator's cheat menu, choosing the format that matches your emulator.
| Effect | Code |
|---|---|
| Invulnerability | 00CD-E358 |
| Invulnerability | 000-18D-4CA |
| Level Select | 00C4-0000 |
| Infinite Time - One's Digit (P1 Only) | 00CF-E409 |
| Infinite Time - Ten's Digit (P1 Only) | 00CF-E509 |
| Infinite Time - Hundred's Digit (P1 Only) | 00CF-E609 |
| Infinite "STY" | 00CD-E709 |
| High "SCR" (1080ish) | 00CD-D980 |
| Number of Enemies Modifier | 00C4-D600 |
| Infinite Lives - Both Players | 00A-F7E-3BE |
| Infinite Time | B62-60E-3BE |
| Start with ?? Lives, instead of 3 - Both Players | 048-2DE-E66 |
| P1 Infinite Lives | 00CD-E709 |
| P2 Infinite Lives | 00CE-2709 |
| Freeze Timer | 00CF-E33C |
Using cheats today
Original cheat devices like the Game Genie, Action Replay and GameShark still turn up second-hand and work with original cartridges. Most modern emulators also have a built-in cheat menu that accepts these formats, so you can toggle codes on and off without extra hardware. Codes can differ between regional releases and revisions of a game; if one doesn't work, try the code list for another version.
Cheats can corrupt save files in rare cases, so back up your saves before experimenting.
Gain Ground walkthroughs & guides
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Cheat codes are from the libretro-database community collection, used under CC BY-SA 4.0; the code tables on this page are shared under the same license. Codes are provided as-is: some may not work on every version of the game.